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Commit | Line | Data |
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3993f6b1 | 1 | /* GNU/Linux native-dependent code common to multiple platforms. |
dba24537 | 2 | |
7b6bb8da JB |
3 | Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, |
4 | 2011 Free Software Foundation, Inc. | |
3993f6b1 DJ |
5 | |
6 | This file is part of GDB. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 10 | the Free Software Foundation; either version 3 of the License, or |
3993f6b1 DJ |
11 | (at your option) any later version. |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
3993f6b1 DJ |
20 | |
21 | #include "defs.h" | |
22 | #include "inferior.h" | |
23 | #include "target.h" | |
d6b0e80f | 24 | #include "gdb_string.h" |
3993f6b1 | 25 | #include "gdb_wait.h" |
d6b0e80f AC |
26 | #include "gdb_assert.h" |
27 | #ifdef HAVE_TKILL_SYSCALL | |
28 | #include <unistd.h> | |
29 | #include <sys/syscall.h> | |
30 | #endif | |
3993f6b1 | 31 | #include <sys/ptrace.h> |
0274a8ce | 32 | #include "linux-nat.h" |
af96c192 | 33 | #include "linux-ptrace.h" |
13da1c97 | 34 | #include "linux-procfs.h" |
ac264b3b | 35 | #include "linux-fork.h" |
d6b0e80f AC |
36 | #include "gdbthread.h" |
37 | #include "gdbcmd.h" | |
38 | #include "regcache.h" | |
4f844a66 | 39 | #include "regset.h" |
10d6c8cd DJ |
40 | #include "inf-ptrace.h" |
41 | #include "auxv.h" | |
dba24537 | 42 | #include <sys/param.h> /* for MAXPATHLEN */ |
1777feb0 | 43 | #include <sys/procfs.h> /* for elf_gregset etc. */ |
dba24537 AC |
44 | #include "elf-bfd.h" /* for elfcore_write_* */ |
45 | #include "gregset.h" /* for gregset */ | |
46 | #include "gdbcore.h" /* for get_exec_file */ | |
47 | #include <ctype.h> /* for isdigit */ | |
1777feb0 | 48 | #include "gdbthread.h" /* for struct thread_info etc. */ |
dba24537 AC |
49 | #include "gdb_stat.h" /* for struct stat */ |
50 | #include <fcntl.h> /* for O_RDONLY */ | |
b84876c2 PA |
51 | #include "inf-loop.h" |
52 | #include "event-loop.h" | |
53 | #include "event-top.h" | |
07e059b5 VP |
54 | #include <pwd.h> |
55 | #include <sys/types.h> | |
56 | #include "gdb_dirent.h" | |
57 | #include "xml-support.h" | |
191c4426 | 58 | #include "terminal.h" |
efcbbd14 | 59 | #include <sys/vfs.h> |
6c95b8df | 60 | #include "solib.h" |
d26e3629 | 61 | #include "linux-osdata.h" |
f179e162 | 62 | #include "cli/cli-utils.h" |
efcbbd14 UW |
63 | |
64 | #ifndef SPUFS_MAGIC | |
65 | #define SPUFS_MAGIC 0x23c9b64e | |
66 | #endif | |
dba24537 | 67 | |
10568435 JK |
68 | #ifdef HAVE_PERSONALITY |
69 | # include <sys/personality.h> | |
70 | # if !HAVE_DECL_ADDR_NO_RANDOMIZE | |
71 | # define ADDR_NO_RANDOMIZE 0x0040000 | |
72 | # endif | |
73 | #endif /* HAVE_PERSONALITY */ | |
74 | ||
1777feb0 | 75 | /* This comment documents high-level logic of this file. |
8a77dff3 VP |
76 | |
77 | Waiting for events in sync mode | |
78 | =============================== | |
79 | ||
80 | When waiting for an event in a specific thread, we just use waitpid, passing | |
81 | the specific pid, and not passing WNOHANG. | |
82 | ||
1777feb0 | 83 | When waiting for an event in all threads, waitpid is not quite good. Prior to |
8a77dff3 | 84 | version 2.4, Linux can either wait for event in main thread, or in secondary |
1777feb0 | 85 | threads. (2.4 has the __WALL flag). So, if we use blocking waitpid, we might |
8a77dff3 VP |
86 | miss an event. The solution is to use non-blocking waitpid, together with |
87 | sigsuspend. First, we use non-blocking waitpid to get an event in the main | |
1777feb0 | 88 | process, if any. Second, we use non-blocking waitpid with the __WCLONED |
8a77dff3 VP |
89 | flag to check for events in cloned processes. If nothing is found, we use |
90 | sigsuspend to wait for SIGCHLD. When SIGCHLD arrives, it means something | |
91 | happened to a child process -- and SIGCHLD will be delivered both for events | |
92 | in main debugged process and in cloned processes. As soon as we know there's | |
3e43a32a MS |
93 | an event, we get back to calling nonblocking waitpid with and without |
94 | __WCLONED. | |
8a77dff3 VP |
95 | |
96 | Note that SIGCHLD should be blocked between waitpid and sigsuspend calls, | |
1777feb0 | 97 | so that we don't miss a signal. If SIGCHLD arrives in between, when it's |
8a77dff3 VP |
98 | blocked, the signal becomes pending and sigsuspend immediately |
99 | notices it and returns. | |
100 | ||
101 | Waiting for events in async mode | |
102 | ================================ | |
103 | ||
7feb7d06 PA |
104 | In async mode, GDB should always be ready to handle both user input |
105 | and target events, so neither blocking waitpid nor sigsuspend are | |
106 | viable options. Instead, we should asynchronously notify the GDB main | |
107 | event loop whenever there's an unprocessed event from the target. We | |
108 | detect asynchronous target events by handling SIGCHLD signals. To | |
109 | notify the event loop about target events, the self-pipe trick is used | |
110 | --- a pipe is registered as waitable event source in the event loop, | |
111 | the event loop select/poll's on the read end of this pipe (as well on | |
112 | other event sources, e.g., stdin), and the SIGCHLD handler writes a | |
113 | byte to this pipe. This is more portable than relying on | |
114 | pselect/ppoll, since on kernels that lack those syscalls, libc | |
115 | emulates them with select/poll+sigprocmask, and that is racy | |
116 | (a.k.a. plain broken). | |
117 | ||
118 | Obviously, if we fail to notify the event loop if there's a target | |
119 | event, it's bad. OTOH, if we notify the event loop when there's no | |
120 | event from the target, linux_nat_wait will detect that there's no real | |
121 | event to report, and return event of type TARGET_WAITKIND_IGNORE. | |
122 | This is mostly harmless, but it will waste time and is better avoided. | |
123 | ||
124 | The main design point is that every time GDB is outside linux-nat.c, | |
125 | we have a SIGCHLD handler installed that is called when something | |
126 | happens to the target and notifies the GDB event loop. Whenever GDB | |
127 | core decides to handle the event, and calls into linux-nat.c, we | |
128 | process things as in sync mode, except that the we never block in | |
129 | sigsuspend. | |
130 | ||
131 | While processing an event, we may end up momentarily blocked in | |
132 | waitpid calls. Those waitpid calls, while blocking, are guarantied to | |
133 | return quickly. E.g., in all-stop mode, before reporting to the core | |
134 | that an LWP hit a breakpoint, all LWPs are stopped by sending them | |
135 | SIGSTOP, and synchronously waiting for the SIGSTOP to be reported. | |
136 | Note that this is different from blocking indefinitely waiting for the | |
137 | next event --- here, we're already handling an event. | |
8a77dff3 VP |
138 | |
139 | Use of signals | |
140 | ============== | |
141 | ||
142 | We stop threads by sending a SIGSTOP. The use of SIGSTOP instead of another | |
143 | signal is not entirely significant; we just need for a signal to be delivered, | |
144 | so that we can intercept it. SIGSTOP's advantage is that it can not be | |
145 | blocked. A disadvantage is that it is not a real-time signal, so it can only | |
146 | be queued once; we do not keep track of other sources of SIGSTOP. | |
147 | ||
148 | Two other signals that can't be blocked are SIGCONT and SIGKILL. But we can't | |
149 | use them, because they have special behavior when the signal is generated - | |
150 | not when it is delivered. SIGCONT resumes the entire thread group and SIGKILL | |
151 | kills the entire thread group. | |
152 | ||
153 | A delivered SIGSTOP would stop the entire thread group, not just the thread we | |
154 | tkill'd. But we never let the SIGSTOP be delivered; we always intercept and | |
155 | cancel it (by PTRACE_CONT without passing SIGSTOP). | |
156 | ||
157 | We could use a real-time signal instead. This would solve those problems; we | |
158 | could use PTRACE_GETSIGINFO to locate the specific stop signals sent by GDB. | |
159 | But we would still have to have some support for SIGSTOP, since PTRACE_ATTACH | |
160 | generates it, and there are races with trying to find a signal that is not | |
161 | blocked. */ | |
a0ef4274 | 162 | |
dba24537 AC |
163 | #ifndef O_LARGEFILE |
164 | #define O_LARGEFILE 0 | |
165 | #endif | |
0274a8ce | 166 | |
ca2163eb PA |
167 | /* Unlike other extended result codes, WSTOPSIG (status) on |
168 | PTRACE_O_TRACESYSGOOD syscall events doesn't return SIGTRAP, but | |
169 | instead SIGTRAP with bit 7 set. */ | |
170 | #define SYSCALL_SIGTRAP (SIGTRAP | 0x80) | |
171 | ||
10d6c8cd DJ |
172 | /* The single-threaded native GNU/Linux target_ops. We save a pointer for |
173 | the use of the multi-threaded target. */ | |
174 | static struct target_ops *linux_ops; | |
f973ed9c | 175 | static struct target_ops linux_ops_saved; |
10d6c8cd | 176 | |
9f0bdab8 DJ |
177 | /* The method to call, if any, when a new thread is attached. */ |
178 | static void (*linux_nat_new_thread) (ptid_t); | |
179 | ||
5b009018 PA |
180 | /* The method to call, if any, when the siginfo object needs to be |
181 | converted between the layout returned by ptrace, and the layout in | |
182 | the architecture of the inferior. */ | |
183 | static int (*linux_nat_siginfo_fixup) (struct siginfo *, | |
184 | gdb_byte *, | |
185 | int); | |
186 | ||
ac264b3b MS |
187 | /* The saved to_xfer_partial method, inherited from inf-ptrace.c. |
188 | Called by our to_xfer_partial. */ | |
189 | static LONGEST (*super_xfer_partial) (struct target_ops *, | |
190 | enum target_object, | |
191 | const char *, gdb_byte *, | |
192 | const gdb_byte *, | |
10d6c8cd DJ |
193 | ULONGEST, LONGEST); |
194 | ||
d6b0e80f | 195 | static int debug_linux_nat; |
920d2a44 AC |
196 | static void |
197 | show_debug_linux_nat (struct ui_file *file, int from_tty, | |
198 | struct cmd_list_element *c, const char *value) | |
199 | { | |
200 | fprintf_filtered (file, _("Debugging of GNU/Linux lwp module is %s.\n"), | |
201 | value); | |
202 | } | |
d6b0e80f | 203 | |
ae087d01 DJ |
204 | struct simple_pid_list |
205 | { | |
206 | int pid; | |
3d799a95 | 207 | int status; |
ae087d01 DJ |
208 | struct simple_pid_list *next; |
209 | }; | |
210 | struct simple_pid_list *stopped_pids; | |
211 | ||
3993f6b1 DJ |
212 | /* This variable is a tri-state flag: -1 for unknown, 0 if PTRACE_O_TRACEFORK |
213 | can not be used, 1 if it can. */ | |
214 | ||
215 | static int linux_supports_tracefork_flag = -1; | |
216 | ||
3e43a32a MS |
217 | /* This variable is a tri-state flag: -1 for unknown, 0 if |
218 | PTRACE_O_TRACESYSGOOD can not be used, 1 if it can. */ | |
a96d9b2e SDJ |
219 | |
220 | static int linux_supports_tracesysgood_flag = -1; | |
221 | ||
9016a515 DJ |
222 | /* If we have PTRACE_O_TRACEFORK, this flag indicates whether we also have |
223 | PTRACE_O_TRACEVFORKDONE. */ | |
224 | ||
225 | static int linux_supports_tracevforkdone_flag = -1; | |
226 | ||
a96d9b2e SDJ |
227 | /* Stores the current used ptrace() options. */ |
228 | static int current_ptrace_options = 0; | |
229 | ||
3dd5b83d PA |
230 | /* Async mode support. */ |
231 | ||
b84876c2 PA |
232 | /* The read/write ends of the pipe registered as waitable file in the |
233 | event loop. */ | |
234 | static int linux_nat_event_pipe[2] = { -1, -1 }; | |
235 | ||
7feb7d06 | 236 | /* Flush the event pipe. */ |
b84876c2 | 237 | |
7feb7d06 PA |
238 | static void |
239 | async_file_flush (void) | |
b84876c2 | 240 | { |
7feb7d06 PA |
241 | int ret; |
242 | char buf; | |
b84876c2 | 243 | |
7feb7d06 | 244 | do |
b84876c2 | 245 | { |
7feb7d06 | 246 | ret = read (linux_nat_event_pipe[0], &buf, 1); |
b84876c2 | 247 | } |
7feb7d06 | 248 | while (ret >= 0 || (ret == -1 && errno == EINTR)); |
b84876c2 PA |
249 | } |
250 | ||
7feb7d06 PA |
251 | /* Put something (anything, doesn't matter what, or how much) in event |
252 | pipe, so that the select/poll in the event-loop realizes we have | |
253 | something to process. */ | |
252fbfc8 | 254 | |
b84876c2 | 255 | static void |
7feb7d06 | 256 | async_file_mark (void) |
b84876c2 | 257 | { |
7feb7d06 | 258 | int ret; |
b84876c2 | 259 | |
7feb7d06 PA |
260 | /* It doesn't really matter what the pipe contains, as long we end |
261 | up with something in it. Might as well flush the previous | |
262 | left-overs. */ | |
263 | async_file_flush (); | |
b84876c2 | 264 | |
7feb7d06 | 265 | do |
b84876c2 | 266 | { |
7feb7d06 | 267 | ret = write (linux_nat_event_pipe[1], "+", 1); |
b84876c2 | 268 | } |
7feb7d06 | 269 | while (ret == -1 && errno == EINTR); |
b84876c2 | 270 | |
7feb7d06 PA |
271 | /* Ignore EAGAIN. If the pipe is full, the event loop will already |
272 | be awakened anyway. */ | |
b84876c2 PA |
273 | } |
274 | ||
7feb7d06 | 275 | static void linux_nat_async (void (*callback) |
3e43a32a MS |
276 | (enum inferior_event_type event_type, |
277 | void *context), | |
7feb7d06 | 278 | void *context); |
7feb7d06 PA |
279 | static int kill_lwp (int lwpid, int signo); |
280 | ||
281 | static int stop_callback (struct lwp_info *lp, void *data); | |
282 | ||
283 | static void block_child_signals (sigset_t *prev_mask); | |
284 | static void restore_child_signals_mask (sigset_t *prev_mask); | |
2277426b PA |
285 | |
286 | struct lwp_info; | |
287 | static struct lwp_info *add_lwp (ptid_t ptid); | |
288 | static void purge_lwp_list (int pid); | |
289 | static struct lwp_info *find_lwp_pid (ptid_t ptid); | |
290 | ||
ae087d01 DJ |
291 | \f |
292 | /* Trivial list manipulation functions to keep track of a list of | |
293 | new stopped processes. */ | |
294 | static void | |
3d799a95 | 295 | add_to_pid_list (struct simple_pid_list **listp, int pid, int status) |
ae087d01 DJ |
296 | { |
297 | struct simple_pid_list *new_pid = xmalloc (sizeof (struct simple_pid_list)); | |
e0881a8e | 298 | |
ae087d01 | 299 | new_pid->pid = pid; |
3d799a95 | 300 | new_pid->status = status; |
ae087d01 DJ |
301 | new_pid->next = *listp; |
302 | *listp = new_pid; | |
303 | } | |
304 | ||
84636d28 PA |
305 | static int |
306 | in_pid_list_p (struct simple_pid_list *list, int pid) | |
307 | { | |
308 | struct simple_pid_list *p; | |
309 | ||
310 | for (p = list; p != NULL; p = p->next) | |
311 | if (p->pid == pid) | |
312 | return 1; | |
313 | return 0; | |
314 | } | |
315 | ||
ae087d01 | 316 | static int |
46a96992 | 317 | pull_pid_from_list (struct simple_pid_list **listp, int pid, int *statusp) |
ae087d01 DJ |
318 | { |
319 | struct simple_pid_list **p; | |
320 | ||
321 | for (p = listp; *p != NULL; p = &(*p)->next) | |
322 | if ((*p)->pid == pid) | |
323 | { | |
324 | struct simple_pid_list *next = (*p)->next; | |
e0881a8e | 325 | |
46a96992 | 326 | *statusp = (*p)->status; |
ae087d01 DJ |
327 | xfree (*p); |
328 | *p = next; | |
329 | return 1; | |
330 | } | |
331 | return 0; | |
332 | } | |
333 | ||
3993f6b1 DJ |
334 | \f |
335 | /* A helper function for linux_test_for_tracefork, called after fork (). */ | |
336 | ||
337 | static void | |
338 | linux_tracefork_child (void) | |
339 | { | |
3993f6b1 DJ |
340 | ptrace (PTRACE_TRACEME, 0, 0, 0); |
341 | kill (getpid (), SIGSTOP); | |
342 | fork (); | |
48bb3cce | 343 | _exit (0); |
3993f6b1 DJ |
344 | } |
345 | ||
7feb7d06 | 346 | /* Wrapper function for waitpid which handles EINTR. */ |
b957e937 DJ |
347 | |
348 | static int | |
46a96992 | 349 | my_waitpid (int pid, int *statusp, int flags) |
b957e937 DJ |
350 | { |
351 | int ret; | |
b84876c2 | 352 | |
b957e937 DJ |
353 | do |
354 | { | |
46a96992 | 355 | ret = waitpid (pid, statusp, flags); |
b957e937 DJ |
356 | } |
357 | while (ret == -1 && errno == EINTR); | |
358 | ||
359 | return ret; | |
360 | } | |
361 | ||
362 | /* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. | |
363 | ||
364 | First, we try to enable fork tracing on ORIGINAL_PID. If this fails, | |
365 | we know that the feature is not available. This may change the tracing | |
366 | options for ORIGINAL_PID, but we'll be setting them shortly anyway. | |
367 | ||
368 | However, if it succeeds, we don't know for sure that the feature is | |
369 | available; old versions of PTRACE_SETOPTIONS ignored unknown options. We | |
3993f6b1 | 370 | create a child process, attach to it, use PTRACE_SETOPTIONS to enable |
b957e937 DJ |
371 | fork tracing, and let it fork. If the process exits, we assume that we |
372 | can't use TRACEFORK; if we get the fork notification, and we can extract | |
373 | the new child's PID, then we assume that we can. */ | |
3993f6b1 DJ |
374 | |
375 | static void | |
b957e937 | 376 | linux_test_for_tracefork (int original_pid) |
3993f6b1 DJ |
377 | { |
378 | int child_pid, ret, status; | |
379 | long second_pid; | |
7feb7d06 | 380 | sigset_t prev_mask; |
4c28f408 | 381 | |
7feb7d06 PA |
382 | /* We don't want those ptrace calls to be interrupted. */ |
383 | block_child_signals (&prev_mask); | |
3993f6b1 | 384 | |
b957e937 DJ |
385 | linux_supports_tracefork_flag = 0; |
386 | linux_supports_tracevforkdone_flag = 0; | |
387 | ||
388 | ret = ptrace (PTRACE_SETOPTIONS, original_pid, 0, PTRACE_O_TRACEFORK); | |
389 | if (ret != 0) | |
7feb7d06 PA |
390 | { |
391 | restore_child_signals_mask (&prev_mask); | |
392 | return; | |
393 | } | |
b957e937 | 394 | |
3993f6b1 DJ |
395 | child_pid = fork (); |
396 | if (child_pid == -1) | |
e2e0b3e5 | 397 | perror_with_name (("fork")); |
3993f6b1 DJ |
398 | |
399 | if (child_pid == 0) | |
400 | linux_tracefork_child (); | |
401 | ||
b957e937 | 402 | ret = my_waitpid (child_pid, &status, 0); |
3993f6b1 | 403 | if (ret == -1) |
e2e0b3e5 | 404 | perror_with_name (("waitpid")); |
3993f6b1 | 405 | else if (ret != child_pid) |
8a3fe4f8 | 406 | error (_("linux_test_for_tracefork: waitpid: unexpected result %d."), ret); |
3993f6b1 | 407 | if (! WIFSTOPPED (status)) |
3e43a32a MS |
408 | error (_("linux_test_for_tracefork: waitpid: unexpected status %d."), |
409 | status); | |
3993f6b1 | 410 | |
3993f6b1 DJ |
411 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, PTRACE_O_TRACEFORK); |
412 | if (ret != 0) | |
413 | { | |
b957e937 DJ |
414 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); |
415 | if (ret != 0) | |
416 | { | |
8a3fe4f8 | 417 | warning (_("linux_test_for_tracefork: failed to kill child")); |
7feb7d06 | 418 | restore_child_signals_mask (&prev_mask); |
b957e937 DJ |
419 | return; |
420 | } | |
421 | ||
422 | ret = my_waitpid (child_pid, &status, 0); | |
423 | if (ret != child_pid) | |
3e43a32a MS |
424 | warning (_("linux_test_for_tracefork: failed " |
425 | "to wait for killed child")); | |
b957e937 | 426 | else if (!WIFSIGNALED (status)) |
3e43a32a MS |
427 | warning (_("linux_test_for_tracefork: unexpected " |
428 | "wait status 0x%x from killed child"), status); | |
b957e937 | 429 | |
7feb7d06 | 430 | restore_child_signals_mask (&prev_mask); |
3993f6b1 DJ |
431 | return; |
432 | } | |
433 | ||
9016a515 DJ |
434 | /* Check whether PTRACE_O_TRACEVFORKDONE is available. */ |
435 | ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, | |
436 | PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORKDONE); | |
437 | linux_supports_tracevforkdone_flag = (ret == 0); | |
438 | ||
b957e937 DJ |
439 | ret = ptrace (PTRACE_CONT, child_pid, 0, 0); |
440 | if (ret != 0) | |
8a3fe4f8 | 441 | warning (_("linux_test_for_tracefork: failed to resume child")); |
b957e937 DJ |
442 | |
443 | ret = my_waitpid (child_pid, &status, 0); | |
444 | ||
3993f6b1 DJ |
445 | if (ret == child_pid && WIFSTOPPED (status) |
446 | && status >> 16 == PTRACE_EVENT_FORK) | |
447 | { | |
448 | second_pid = 0; | |
449 | ret = ptrace (PTRACE_GETEVENTMSG, child_pid, 0, &second_pid); | |
450 | if (ret == 0 && second_pid != 0) | |
451 | { | |
452 | int second_status; | |
453 | ||
454 | linux_supports_tracefork_flag = 1; | |
b957e937 DJ |
455 | my_waitpid (second_pid, &second_status, 0); |
456 | ret = ptrace (PTRACE_KILL, second_pid, 0, 0); | |
457 | if (ret != 0) | |
3e43a32a MS |
458 | warning (_("linux_test_for_tracefork: " |
459 | "failed to kill second child")); | |
97725dc4 | 460 | my_waitpid (second_pid, &status, 0); |
3993f6b1 DJ |
461 | } |
462 | } | |
b957e937 | 463 | else |
8a3fe4f8 AC |
464 | warning (_("linux_test_for_tracefork: unexpected result from waitpid " |
465 | "(%d, status 0x%x)"), ret, status); | |
3993f6b1 | 466 | |
b957e937 DJ |
467 | ret = ptrace (PTRACE_KILL, child_pid, 0, 0); |
468 | if (ret != 0) | |
8a3fe4f8 | 469 | warning (_("linux_test_for_tracefork: failed to kill child")); |
b957e937 | 470 | my_waitpid (child_pid, &status, 0); |
4c28f408 | 471 | |
7feb7d06 | 472 | restore_child_signals_mask (&prev_mask); |
3993f6b1 DJ |
473 | } |
474 | ||
a96d9b2e SDJ |
475 | /* Determine if PTRACE_O_TRACESYSGOOD can be used to follow syscalls. |
476 | ||
477 | We try to enable syscall tracing on ORIGINAL_PID. If this fails, | |
478 | we know that the feature is not available. This may change the tracing | |
479 | options for ORIGINAL_PID, but we'll be setting them shortly anyway. */ | |
480 | ||
481 | static void | |
482 | linux_test_for_tracesysgood (int original_pid) | |
483 | { | |
484 | int ret; | |
485 | sigset_t prev_mask; | |
486 | ||
487 | /* We don't want those ptrace calls to be interrupted. */ | |
488 | block_child_signals (&prev_mask); | |
489 | ||
490 | linux_supports_tracesysgood_flag = 0; | |
491 | ||
492 | ret = ptrace (PTRACE_SETOPTIONS, original_pid, 0, PTRACE_O_TRACESYSGOOD); | |
493 | if (ret != 0) | |
494 | goto out; | |
495 | ||
496 | linux_supports_tracesysgood_flag = 1; | |
497 | out: | |
498 | restore_child_signals_mask (&prev_mask); | |
499 | } | |
500 | ||
501 | /* Determine wether we support PTRACE_O_TRACESYSGOOD option available. | |
502 | This function also sets linux_supports_tracesysgood_flag. */ | |
503 | ||
504 | static int | |
505 | linux_supports_tracesysgood (int pid) | |
506 | { | |
507 | if (linux_supports_tracesysgood_flag == -1) | |
508 | linux_test_for_tracesysgood (pid); | |
509 | return linux_supports_tracesysgood_flag; | |
510 | } | |
511 | ||
3993f6b1 DJ |
512 | /* Return non-zero iff we have tracefork functionality available. |
513 | This function also sets linux_supports_tracefork_flag. */ | |
514 | ||
515 | static int | |
b957e937 | 516 | linux_supports_tracefork (int pid) |
3993f6b1 DJ |
517 | { |
518 | if (linux_supports_tracefork_flag == -1) | |
b957e937 | 519 | linux_test_for_tracefork (pid); |
3993f6b1 DJ |
520 | return linux_supports_tracefork_flag; |
521 | } | |
522 | ||
9016a515 | 523 | static int |
b957e937 | 524 | linux_supports_tracevforkdone (int pid) |
9016a515 DJ |
525 | { |
526 | if (linux_supports_tracefork_flag == -1) | |
b957e937 | 527 | linux_test_for_tracefork (pid); |
9016a515 DJ |
528 | return linux_supports_tracevforkdone_flag; |
529 | } | |
530 | ||
a96d9b2e SDJ |
531 | static void |
532 | linux_enable_tracesysgood (ptid_t ptid) | |
533 | { | |
534 | int pid = ptid_get_lwp (ptid); | |
535 | ||
536 | if (pid == 0) | |
537 | pid = ptid_get_pid (ptid); | |
538 | ||
539 | if (linux_supports_tracesysgood (pid) == 0) | |
540 | return; | |
541 | ||
542 | current_ptrace_options |= PTRACE_O_TRACESYSGOOD; | |
543 | ||
544 | ptrace (PTRACE_SETOPTIONS, pid, 0, current_ptrace_options); | |
545 | } | |
546 | ||
3993f6b1 | 547 | \f |
4de4c07c DJ |
548 | void |
549 | linux_enable_event_reporting (ptid_t ptid) | |
550 | { | |
d3587048 | 551 | int pid = ptid_get_lwp (ptid); |
4de4c07c | 552 | |
d3587048 DJ |
553 | if (pid == 0) |
554 | pid = ptid_get_pid (ptid); | |
555 | ||
b957e937 | 556 | if (! linux_supports_tracefork (pid)) |
4de4c07c DJ |
557 | return; |
558 | ||
a96d9b2e SDJ |
559 | current_ptrace_options |= PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORK |
560 | | PTRACE_O_TRACEEXEC | PTRACE_O_TRACECLONE; | |
561 | ||
b957e937 | 562 | if (linux_supports_tracevforkdone (pid)) |
a96d9b2e | 563 | current_ptrace_options |= PTRACE_O_TRACEVFORKDONE; |
9016a515 DJ |
564 | |
565 | /* Do not enable PTRACE_O_TRACEEXIT until GDB is more prepared to support | |
566 | read-only process state. */ | |
4de4c07c | 567 | |
a96d9b2e | 568 | ptrace (PTRACE_SETOPTIONS, pid, 0, current_ptrace_options); |
4de4c07c DJ |
569 | } |
570 | ||
6d8fd2b7 UW |
571 | static void |
572 | linux_child_post_attach (int pid) | |
4de4c07c DJ |
573 | { |
574 | linux_enable_event_reporting (pid_to_ptid (pid)); | |
a96d9b2e | 575 | linux_enable_tracesysgood (pid_to_ptid (pid)); |
4de4c07c DJ |
576 | } |
577 | ||
10d6c8cd | 578 | static void |
4de4c07c DJ |
579 | linux_child_post_startup_inferior (ptid_t ptid) |
580 | { | |
581 | linux_enable_event_reporting (ptid); | |
a96d9b2e | 582 | linux_enable_tracesysgood (ptid); |
4de4c07c DJ |
583 | } |
584 | ||
6d8fd2b7 UW |
585 | static int |
586 | linux_child_follow_fork (struct target_ops *ops, int follow_child) | |
3993f6b1 | 587 | { |
7feb7d06 | 588 | sigset_t prev_mask; |
9016a515 | 589 | int has_vforked; |
4de4c07c DJ |
590 | int parent_pid, child_pid; |
591 | ||
7feb7d06 | 592 | block_child_signals (&prev_mask); |
b84876c2 | 593 | |
e58b0e63 PA |
594 | has_vforked = (inferior_thread ()->pending_follow.kind |
595 | == TARGET_WAITKIND_VFORKED); | |
596 | parent_pid = ptid_get_lwp (inferior_ptid); | |
d3587048 | 597 | if (parent_pid == 0) |
e58b0e63 PA |
598 | parent_pid = ptid_get_pid (inferior_ptid); |
599 | child_pid = PIDGET (inferior_thread ()->pending_follow.value.related_pid); | |
4de4c07c | 600 | |
2277426b PA |
601 | if (!detach_fork) |
602 | linux_enable_event_reporting (pid_to_ptid (child_pid)); | |
603 | ||
6c95b8df PA |
604 | if (has_vforked |
605 | && !non_stop /* Non-stop always resumes both branches. */ | |
606 | && (!target_is_async_p () || sync_execution) | |
607 | && !(follow_child || detach_fork || sched_multi)) | |
608 | { | |
609 | /* The parent stays blocked inside the vfork syscall until the | |
610 | child execs or exits. If we don't let the child run, then | |
611 | the parent stays blocked. If we're telling the parent to run | |
612 | in the foreground, the user will not be able to ctrl-c to get | |
613 | back the terminal, effectively hanging the debug session. */ | |
ac74f770 MS |
614 | fprintf_filtered (gdb_stderr, _("\ |
615 | Can not resume the parent process over vfork in the foreground while\n\ | |
616 | holding the child stopped. Try \"set detach-on-fork\" or \ | |
617 | \"set schedule-multiple\".\n")); | |
618 | /* FIXME output string > 80 columns. */ | |
6c95b8df PA |
619 | return 1; |
620 | } | |
621 | ||
4de4c07c DJ |
622 | if (! follow_child) |
623 | { | |
6c95b8df | 624 | struct lwp_info *child_lp = NULL; |
4de4c07c | 625 | |
1777feb0 | 626 | /* We're already attached to the parent, by default. */ |
4de4c07c | 627 | |
ac264b3b MS |
628 | /* Detach new forked process? */ |
629 | if (detach_fork) | |
f75c00e4 | 630 | { |
6c95b8df PA |
631 | /* Before detaching from the child, remove all breakpoints |
632 | from it. If we forked, then this has already been taken | |
633 | care of by infrun.c. If we vforked however, any | |
634 | breakpoint inserted in the parent is visible in the | |
635 | child, even those added while stopped in a vfork | |
636 | catchpoint. This will remove the breakpoints from the | |
637 | parent also, but they'll be reinserted below. */ | |
638 | if (has_vforked) | |
639 | { | |
640 | /* keep breakpoints list in sync. */ | |
641 | remove_breakpoints_pid (GET_PID (inferior_ptid)); | |
642 | } | |
643 | ||
e85a822c | 644 | if (info_verbose || debug_linux_nat) |
ac264b3b MS |
645 | { |
646 | target_terminal_ours (); | |
647 | fprintf_filtered (gdb_stdlog, | |
3e43a32a MS |
648 | "Detaching after fork from " |
649 | "child process %d.\n", | |
ac264b3b MS |
650 | child_pid); |
651 | } | |
4de4c07c | 652 | |
ac264b3b MS |
653 | ptrace (PTRACE_DETACH, child_pid, 0, 0); |
654 | } | |
655 | else | |
656 | { | |
77435e4c | 657 | struct inferior *parent_inf, *child_inf; |
2277426b | 658 | struct cleanup *old_chain; |
7f9f62ba PA |
659 | |
660 | /* Add process to GDB's tables. */ | |
77435e4c PA |
661 | child_inf = add_inferior (child_pid); |
662 | ||
e58b0e63 | 663 | parent_inf = current_inferior (); |
77435e4c | 664 | child_inf->attach_flag = parent_inf->attach_flag; |
191c4426 | 665 | copy_terminal_info (child_inf, parent_inf); |
7f9f62ba | 666 | |
2277426b | 667 | old_chain = save_inferior_ptid (); |
6c95b8df | 668 | save_current_program_space (); |
2277426b PA |
669 | |
670 | inferior_ptid = ptid_build (child_pid, child_pid, 0); | |
671 | add_thread (inferior_ptid); | |
6c95b8df PA |
672 | child_lp = add_lwp (inferior_ptid); |
673 | child_lp->stopped = 1; | |
25289eb2 | 674 | child_lp->last_resume_kind = resume_stop; |
2277426b | 675 | |
6c95b8df PA |
676 | /* If this is a vfork child, then the address-space is |
677 | shared with the parent. */ | |
678 | if (has_vforked) | |
679 | { | |
680 | child_inf->pspace = parent_inf->pspace; | |
681 | child_inf->aspace = parent_inf->aspace; | |
682 | ||
683 | /* The parent will be frozen until the child is done | |
684 | with the shared region. Keep track of the | |
685 | parent. */ | |
686 | child_inf->vfork_parent = parent_inf; | |
687 | child_inf->pending_detach = 0; | |
688 | parent_inf->vfork_child = child_inf; | |
689 | parent_inf->pending_detach = 0; | |
690 | } | |
691 | else | |
692 | { | |
693 | child_inf->aspace = new_address_space (); | |
694 | child_inf->pspace = add_program_space (child_inf->aspace); | |
695 | child_inf->removable = 1; | |
696 | set_current_program_space (child_inf->pspace); | |
697 | clone_program_space (child_inf->pspace, parent_inf->pspace); | |
698 | ||
699 | /* Let the shared library layer (solib-svr4) learn about | |
700 | this new process, relocate the cloned exec, pull in | |
701 | shared libraries, and install the solib event | |
702 | breakpoint. If a "cloned-VM" event was propagated | |
703 | better throughout the core, this wouldn't be | |
704 | required. */ | |
268a4a75 | 705 | solib_create_inferior_hook (0); |
6c95b8df PA |
706 | } |
707 | ||
708 | /* Let the thread_db layer learn about this new process. */ | |
2277426b PA |
709 | check_for_thread_db (); |
710 | ||
711 | do_cleanups (old_chain); | |
ac264b3b | 712 | } |
9016a515 DJ |
713 | |
714 | if (has_vforked) | |
715 | { | |
3ced3da4 | 716 | struct lwp_info *parent_lp; |
6c95b8df PA |
717 | struct inferior *parent_inf; |
718 | ||
719 | parent_inf = current_inferior (); | |
720 | ||
721 | /* If we detached from the child, then we have to be careful | |
722 | to not insert breakpoints in the parent until the child | |
723 | is done with the shared memory region. However, if we're | |
724 | staying attached to the child, then we can and should | |
725 | insert breakpoints, so that we can debug it. A | |
726 | subsequent child exec or exit is enough to know when does | |
727 | the child stops using the parent's address space. */ | |
728 | parent_inf->waiting_for_vfork_done = detach_fork; | |
56710373 | 729 | parent_inf->pspace->breakpoints_not_allowed = detach_fork; |
6c95b8df | 730 | |
3ced3da4 | 731 | parent_lp = find_lwp_pid (pid_to_ptid (parent_pid)); |
b957e937 | 732 | gdb_assert (linux_supports_tracefork_flag >= 0); |
3ced3da4 | 733 | |
b957e937 | 734 | if (linux_supports_tracevforkdone (0)) |
9016a515 | 735 | { |
6c95b8df PA |
736 | if (debug_linux_nat) |
737 | fprintf_unfiltered (gdb_stdlog, | |
738 | "LCFF: waiting for VFORK_DONE on %d\n", | |
739 | parent_pid); | |
3ced3da4 | 740 | parent_lp->stopped = 1; |
9016a515 | 741 | |
6c95b8df PA |
742 | /* We'll handle the VFORK_DONE event like any other |
743 | event, in target_wait. */ | |
9016a515 DJ |
744 | } |
745 | else | |
746 | { | |
747 | /* We can't insert breakpoints until the child has | |
748 | finished with the shared memory region. We need to | |
749 | wait until that happens. Ideal would be to just | |
750 | call: | |
751 | - ptrace (PTRACE_SYSCALL, parent_pid, 0, 0); | |
752 | - waitpid (parent_pid, &status, __WALL); | |
753 | However, most architectures can't handle a syscall | |
754 | being traced on the way out if it wasn't traced on | |
755 | the way in. | |
756 | ||
757 | We might also think to loop, continuing the child | |
758 | until it exits or gets a SIGTRAP. One problem is | |
759 | that the child might call ptrace with PTRACE_TRACEME. | |
760 | ||
761 | There's no simple and reliable way to figure out when | |
762 | the vforked child will be done with its copy of the | |
763 | shared memory. We could step it out of the syscall, | |
764 | two instructions, let it go, and then single-step the | |
765 | parent once. When we have hardware single-step, this | |
766 | would work; with software single-step it could still | |
767 | be made to work but we'd have to be able to insert | |
768 | single-step breakpoints in the child, and we'd have | |
769 | to insert -just- the single-step breakpoint in the | |
770 | parent. Very awkward. | |
771 | ||
772 | In the end, the best we can do is to make sure it | |
773 | runs for a little while. Hopefully it will be out of | |
774 | range of any breakpoints we reinsert. Usually this | |
775 | is only the single-step breakpoint at vfork's return | |
776 | point. */ | |
777 | ||
6c95b8df PA |
778 | if (debug_linux_nat) |
779 | fprintf_unfiltered (gdb_stdlog, | |
3e43a32a MS |
780 | "LCFF: no VFORK_DONE " |
781 | "support, sleeping a bit\n"); | |
6c95b8df | 782 | |
9016a515 | 783 | usleep (10000); |
9016a515 | 784 | |
6c95b8df PA |
785 | /* Pretend we've seen a PTRACE_EVENT_VFORK_DONE event, |
786 | and leave it pending. The next linux_nat_resume call | |
787 | will notice a pending event, and bypasses actually | |
788 | resuming the inferior. */ | |
3ced3da4 PA |
789 | parent_lp->status = 0; |
790 | parent_lp->waitstatus.kind = TARGET_WAITKIND_VFORK_DONE; | |
791 | parent_lp->stopped = 1; | |
6c95b8df PA |
792 | |
793 | /* If we're in async mode, need to tell the event loop | |
794 | there's something here to process. */ | |
795 | if (target_can_async_p ()) | |
796 | async_file_mark (); | |
797 | } | |
9016a515 | 798 | } |
4de4c07c | 799 | } |
3993f6b1 | 800 | else |
4de4c07c | 801 | { |
77435e4c | 802 | struct inferior *parent_inf, *child_inf; |
3ced3da4 | 803 | struct lwp_info *child_lp; |
6c95b8df | 804 | struct program_space *parent_pspace; |
4de4c07c | 805 | |
e85a822c | 806 | if (info_verbose || debug_linux_nat) |
f75c00e4 DJ |
807 | { |
808 | target_terminal_ours (); | |
6c95b8df | 809 | if (has_vforked) |
3e43a32a MS |
810 | fprintf_filtered (gdb_stdlog, |
811 | _("Attaching after process %d " | |
812 | "vfork to child process %d.\n"), | |
6c95b8df PA |
813 | parent_pid, child_pid); |
814 | else | |
3e43a32a MS |
815 | fprintf_filtered (gdb_stdlog, |
816 | _("Attaching after process %d " | |
817 | "fork to child process %d.\n"), | |
6c95b8df | 818 | parent_pid, child_pid); |
f75c00e4 | 819 | } |
4de4c07c | 820 | |
7a7d3353 PA |
821 | /* Add the new inferior first, so that the target_detach below |
822 | doesn't unpush the target. */ | |
823 | ||
77435e4c PA |
824 | child_inf = add_inferior (child_pid); |
825 | ||
e58b0e63 | 826 | parent_inf = current_inferior (); |
77435e4c | 827 | child_inf->attach_flag = parent_inf->attach_flag; |
191c4426 | 828 | copy_terminal_info (child_inf, parent_inf); |
7a7d3353 | 829 | |
6c95b8df | 830 | parent_pspace = parent_inf->pspace; |
9016a515 | 831 | |
6c95b8df PA |
832 | /* If we're vforking, we want to hold on to the parent until the |
833 | child exits or execs. At child exec or exit time we can | |
834 | remove the old breakpoints from the parent and detach or | |
835 | resume debugging it. Otherwise, detach the parent now; we'll | |
836 | want to reuse it's program/address spaces, but we can't set | |
837 | them to the child before removing breakpoints from the | |
838 | parent, otherwise, the breakpoints module could decide to | |
839 | remove breakpoints from the wrong process (since they'd be | |
840 | assigned to the same address space). */ | |
9016a515 DJ |
841 | |
842 | if (has_vforked) | |
7f9f62ba | 843 | { |
6c95b8df PA |
844 | gdb_assert (child_inf->vfork_parent == NULL); |
845 | gdb_assert (parent_inf->vfork_child == NULL); | |
846 | child_inf->vfork_parent = parent_inf; | |
847 | child_inf->pending_detach = 0; | |
848 | parent_inf->vfork_child = child_inf; | |
849 | parent_inf->pending_detach = detach_fork; | |
850 | parent_inf->waiting_for_vfork_done = 0; | |
ac264b3b | 851 | } |
2277426b | 852 | else if (detach_fork) |
b84876c2 | 853 | target_detach (NULL, 0); |
4de4c07c | 854 | |
6c95b8df PA |
855 | /* Note that the detach above makes PARENT_INF dangling. */ |
856 | ||
857 | /* Add the child thread to the appropriate lists, and switch to | |
858 | this new thread, before cloning the program space, and | |
859 | informing the solib layer about this new process. */ | |
860 | ||
9f0bdab8 | 861 | inferior_ptid = ptid_build (child_pid, child_pid, 0); |
2277426b | 862 | add_thread (inferior_ptid); |
3ced3da4 PA |
863 | child_lp = add_lwp (inferior_ptid); |
864 | child_lp->stopped = 1; | |
25289eb2 | 865 | child_lp->last_resume_kind = resume_stop; |
6c95b8df PA |
866 | |
867 | /* If this is a vfork child, then the address-space is shared | |
868 | with the parent. If we detached from the parent, then we can | |
869 | reuse the parent's program/address spaces. */ | |
870 | if (has_vforked || detach_fork) | |
871 | { | |
872 | child_inf->pspace = parent_pspace; | |
873 | child_inf->aspace = child_inf->pspace->aspace; | |
874 | } | |
875 | else | |
876 | { | |
877 | child_inf->aspace = new_address_space (); | |
878 | child_inf->pspace = add_program_space (child_inf->aspace); | |
879 | child_inf->removable = 1; | |
880 | set_current_program_space (child_inf->pspace); | |
881 | clone_program_space (child_inf->pspace, parent_pspace); | |
882 | ||
883 | /* Let the shared library layer (solib-svr4) learn about | |
884 | this new process, relocate the cloned exec, pull in | |
885 | shared libraries, and install the solib event breakpoint. | |
886 | If a "cloned-VM" event was propagated better throughout | |
887 | the core, this wouldn't be required. */ | |
268a4a75 | 888 | solib_create_inferior_hook (0); |
6c95b8df | 889 | } |
ac264b3b | 890 | |
6c95b8df | 891 | /* Let the thread_db layer learn about this new process. */ |
ef29ce1a | 892 | check_for_thread_db (); |
4de4c07c DJ |
893 | } |
894 | ||
7feb7d06 | 895 | restore_child_signals_mask (&prev_mask); |
4de4c07c DJ |
896 | return 0; |
897 | } | |
898 | ||
4de4c07c | 899 | \f |
77b06cd7 | 900 | static int |
6d8fd2b7 | 901 | linux_child_insert_fork_catchpoint (int pid) |
4de4c07c | 902 | { |
77b06cd7 | 903 | return !linux_supports_tracefork (pid); |
3993f6b1 DJ |
904 | } |
905 | ||
eb73ad13 PA |
906 | static int |
907 | linux_child_remove_fork_catchpoint (int pid) | |
908 | { | |
909 | return 0; | |
910 | } | |
911 | ||
77b06cd7 | 912 | static int |
6d8fd2b7 | 913 | linux_child_insert_vfork_catchpoint (int pid) |
3993f6b1 | 914 | { |
77b06cd7 | 915 | return !linux_supports_tracefork (pid); |
3993f6b1 DJ |
916 | } |
917 | ||
eb73ad13 PA |
918 | static int |
919 | linux_child_remove_vfork_catchpoint (int pid) | |
920 | { | |
921 | return 0; | |
922 | } | |
923 | ||
77b06cd7 | 924 | static int |
6d8fd2b7 | 925 | linux_child_insert_exec_catchpoint (int pid) |
3993f6b1 | 926 | { |
77b06cd7 | 927 | return !linux_supports_tracefork (pid); |
3993f6b1 DJ |
928 | } |
929 | ||
eb73ad13 PA |
930 | static int |
931 | linux_child_remove_exec_catchpoint (int pid) | |
932 | { | |
933 | return 0; | |
934 | } | |
935 | ||
a96d9b2e SDJ |
936 | static int |
937 | linux_child_set_syscall_catchpoint (int pid, int needed, int any_count, | |
938 | int table_size, int *table) | |
939 | { | |
77b06cd7 TJB |
940 | if (!linux_supports_tracesysgood (pid)) |
941 | return 1; | |
942 | ||
a96d9b2e SDJ |
943 | /* On GNU/Linux, we ignore the arguments. It means that we only |
944 | enable the syscall catchpoints, but do not disable them. | |
77b06cd7 | 945 | |
a96d9b2e SDJ |
946 | Also, we do not use the `table' information because we do not |
947 | filter system calls here. We let GDB do the logic for us. */ | |
948 | return 0; | |
949 | } | |
950 | ||
d6b0e80f AC |
951 | /* On GNU/Linux there are no real LWP's. The closest thing to LWP's |
952 | are processes sharing the same VM space. A multi-threaded process | |
953 | is basically a group of such processes. However, such a grouping | |
954 | is almost entirely a user-space issue; the kernel doesn't enforce | |
955 | such a grouping at all (this might change in the future). In | |
956 | general, we'll rely on the threads library (i.e. the GNU/Linux | |
957 | Threads library) to provide such a grouping. | |
958 | ||
959 | It is perfectly well possible to write a multi-threaded application | |
960 | without the assistance of a threads library, by using the clone | |
961 | system call directly. This module should be able to give some | |
962 | rudimentary support for debugging such applications if developers | |
963 | specify the CLONE_PTRACE flag in the clone system call, and are | |
964 | using the Linux kernel 2.4 or above. | |
965 | ||
966 | Note that there are some peculiarities in GNU/Linux that affect | |
967 | this code: | |
968 | ||
969 | - In general one should specify the __WCLONE flag to waitpid in | |
970 | order to make it report events for any of the cloned processes | |
971 | (and leave it out for the initial process). However, if a cloned | |
972 | process has exited the exit status is only reported if the | |
973 | __WCLONE flag is absent. Linux kernel 2.4 has a __WALL flag, but | |
974 | we cannot use it since GDB must work on older systems too. | |
975 | ||
976 | - When a traced, cloned process exits and is waited for by the | |
977 | debugger, the kernel reassigns it to the original parent and | |
978 | keeps it around as a "zombie". Somehow, the GNU/Linux Threads | |
979 | library doesn't notice this, which leads to the "zombie problem": | |
980 | When debugged a multi-threaded process that spawns a lot of | |
981 | threads will run out of processes, even if the threads exit, | |
982 | because the "zombies" stay around. */ | |
983 | ||
984 | /* List of known LWPs. */ | |
9f0bdab8 | 985 | struct lwp_info *lwp_list; |
d6b0e80f AC |
986 | \f |
987 | ||
d6b0e80f AC |
988 | /* Original signal mask. */ |
989 | static sigset_t normal_mask; | |
990 | ||
991 | /* Signal mask for use with sigsuspend in linux_nat_wait, initialized in | |
992 | _initialize_linux_nat. */ | |
993 | static sigset_t suspend_mask; | |
994 | ||
7feb7d06 PA |
995 | /* Signals to block to make that sigsuspend work. */ |
996 | static sigset_t blocked_mask; | |
997 | ||
998 | /* SIGCHLD action. */ | |
999 | struct sigaction sigchld_action; | |
b84876c2 | 1000 | |
7feb7d06 PA |
1001 | /* Block child signals (SIGCHLD and linux threads signals), and store |
1002 | the previous mask in PREV_MASK. */ | |
84e46146 | 1003 | |
7feb7d06 PA |
1004 | static void |
1005 | block_child_signals (sigset_t *prev_mask) | |
1006 | { | |
1007 | /* Make sure SIGCHLD is blocked. */ | |
1008 | if (!sigismember (&blocked_mask, SIGCHLD)) | |
1009 | sigaddset (&blocked_mask, SIGCHLD); | |
1010 | ||
1011 | sigprocmask (SIG_BLOCK, &blocked_mask, prev_mask); | |
1012 | } | |
1013 | ||
1014 | /* Restore child signals mask, previously returned by | |
1015 | block_child_signals. */ | |
1016 | ||
1017 | static void | |
1018 | restore_child_signals_mask (sigset_t *prev_mask) | |
1019 | { | |
1020 | sigprocmask (SIG_SETMASK, prev_mask, NULL); | |
1021 | } | |
2455069d UW |
1022 | |
1023 | /* Mask of signals to pass directly to the inferior. */ | |
1024 | static sigset_t pass_mask; | |
1025 | ||
1026 | /* Update signals to pass to the inferior. */ | |
1027 | static void | |
1028 | linux_nat_pass_signals (int numsigs, unsigned char *pass_signals) | |
1029 | { | |
1030 | int signo; | |
1031 | ||
1032 | sigemptyset (&pass_mask); | |
1033 | ||
1034 | for (signo = 1; signo < NSIG; signo++) | |
1035 | { | |
1036 | int target_signo = target_signal_from_host (signo); | |
1037 | if (target_signo < numsigs && pass_signals[target_signo]) | |
1038 | sigaddset (&pass_mask, signo); | |
1039 | } | |
1040 | } | |
1041 | ||
d6b0e80f AC |
1042 | \f |
1043 | ||
1044 | /* Prototypes for local functions. */ | |
1045 | static int stop_wait_callback (struct lwp_info *lp, void *data); | |
28439f5e | 1046 | static int linux_thread_alive (ptid_t ptid); |
6d8fd2b7 | 1047 | static char *linux_child_pid_to_exec_file (int pid); |
710151dd | 1048 | |
d6b0e80f AC |
1049 | \f |
1050 | /* Convert wait status STATUS to a string. Used for printing debug | |
1051 | messages only. */ | |
1052 | ||
1053 | static char * | |
1054 | status_to_str (int status) | |
1055 | { | |
1056 | static char buf[64]; | |
1057 | ||
1058 | if (WIFSTOPPED (status)) | |
206aa767 | 1059 | { |
ca2163eb | 1060 | if (WSTOPSIG (status) == SYSCALL_SIGTRAP) |
206aa767 DE |
1061 | snprintf (buf, sizeof (buf), "%s (stopped at syscall)", |
1062 | strsignal (SIGTRAP)); | |
1063 | else | |
1064 | snprintf (buf, sizeof (buf), "%s (stopped)", | |
1065 | strsignal (WSTOPSIG (status))); | |
1066 | } | |
d6b0e80f AC |
1067 | else if (WIFSIGNALED (status)) |
1068 | snprintf (buf, sizeof (buf), "%s (terminated)", | |
ba9b2ec3 | 1069 | strsignal (WTERMSIG (status))); |
d6b0e80f AC |
1070 | else |
1071 | snprintf (buf, sizeof (buf), "%d (exited)", WEXITSTATUS (status)); | |
1072 | ||
1073 | return buf; | |
1074 | } | |
1075 | ||
d90e17a7 PA |
1076 | /* Remove all LWPs belong to PID from the lwp list. */ |
1077 | ||
1078 | static void | |
1079 | purge_lwp_list (int pid) | |
1080 | { | |
1081 | struct lwp_info *lp, *lpprev, *lpnext; | |
1082 | ||
1083 | lpprev = NULL; | |
1084 | ||
1085 | for (lp = lwp_list; lp; lp = lpnext) | |
1086 | { | |
1087 | lpnext = lp->next; | |
1088 | ||
1089 | if (ptid_get_pid (lp->ptid) == pid) | |
1090 | { | |
1091 | if (lp == lwp_list) | |
1092 | lwp_list = lp->next; | |
1093 | else | |
1094 | lpprev->next = lp->next; | |
1095 | ||
1096 | xfree (lp); | |
1097 | } | |
1098 | else | |
1099 | lpprev = lp; | |
1100 | } | |
1101 | } | |
1102 | ||
1103 | /* Return the number of known LWPs in the tgid given by PID. */ | |
1104 | ||
1105 | static int | |
1106 | num_lwps (int pid) | |
1107 | { | |
1108 | int count = 0; | |
1109 | struct lwp_info *lp; | |
1110 | ||
1111 | for (lp = lwp_list; lp; lp = lp->next) | |
1112 | if (ptid_get_pid (lp->ptid) == pid) | |
1113 | count++; | |
1114 | ||
1115 | return count; | |
d6b0e80f AC |
1116 | } |
1117 | ||
f973ed9c | 1118 | /* Add the LWP specified by PID to the list. Return a pointer to the |
9f0bdab8 DJ |
1119 | structure describing the new LWP. The LWP should already be stopped |
1120 | (with an exception for the very first LWP). */ | |
d6b0e80f AC |
1121 | |
1122 | static struct lwp_info * | |
1123 | add_lwp (ptid_t ptid) | |
1124 | { | |
1125 | struct lwp_info *lp; | |
1126 | ||
1127 | gdb_assert (is_lwp (ptid)); | |
1128 | ||
1129 | lp = (struct lwp_info *) xmalloc (sizeof (struct lwp_info)); | |
1130 | ||
1131 | memset (lp, 0, sizeof (struct lwp_info)); | |
1132 | ||
25289eb2 | 1133 | lp->last_resume_kind = resume_continue; |
d6b0e80f AC |
1134 | lp->waitstatus.kind = TARGET_WAITKIND_IGNORE; |
1135 | ||
1136 | lp->ptid = ptid; | |
dc146f7c | 1137 | lp->core = -1; |
d6b0e80f AC |
1138 | |
1139 | lp->next = lwp_list; | |
1140 | lwp_list = lp; | |
d6b0e80f | 1141 | |
d90e17a7 | 1142 | if (num_lwps (GET_PID (ptid)) > 1 && linux_nat_new_thread != NULL) |
9f0bdab8 DJ |
1143 | linux_nat_new_thread (ptid); |
1144 | ||
d6b0e80f AC |
1145 | return lp; |
1146 | } | |
1147 | ||
1148 | /* Remove the LWP specified by PID from the list. */ | |
1149 | ||
1150 | static void | |
1151 | delete_lwp (ptid_t ptid) | |
1152 | { | |
1153 | struct lwp_info *lp, *lpprev; | |
1154 | ||
1155 | lpprev = NULL; | |
1156 | ||
1157 | for (lp = lwp_list; lp; lpprev = lp, lp = lp->next) | |
1158 | if (ptid_equal (lp->ptid, ptid)) | |
1159 | break; | |
1160 | ||
1161 | if (!lp) | |
1162 | return; | |
1163 | ||
d6b0e80f AC |
1164 | if (lpprev) |
1165 | lpprev->next = lp->next; | |
1166 | else | |
1167 | lwp_list = lp->next; | |
1168 | ||
1169 | xfree (lp); | |
1170 | } | |
1171 | ||
1172 | /* Return a pointer to the structure describing the LWP corresponding | |
1173 | to PID. If no corresponding LWP could be found, return NULL. */ | |
1174 | ||
1175 | static struct lwp_info * | |
1176 | find_lwp_pid (ptid_t ptid) | |
1177 | { | |
1178 | struct lwp_info *lp; | |
1179 | int lwp; | |
1180 | ||
1181 | if (is_lwp (ptid)) | |
1182 | lwp = GET_LWP (ptid); | |
1183 | else | |
1184 | lwp = GET_PID (ptid); | |
1185 | ||
1186 | for (lp = lwp_list; lp; lp = lp->next) | |
1187 | if (lwp == GET_LWP (lp->ptid)) | |
1188 | return lp; | |
1189 | ||
1190 | return NULL; | |
1191 | } | |
1192 | ||
1193 | /* Call CALLBACK with its second argument set to DATA for every LWP in | |
1194 | the list. If CALLBACK returns 1 for a particular LWP, return a | |
1195 | pointer to the structure describing that LWP immediately. | |
1196 | Otherwise return NULL. */ | |
1197 | ||
1198 | struct lwp_info * | |
d90e17a7 PA |
1199 | iterate_over_lwps (ptid_t filter, |
1200 | int (*callback) (struct lwp_info *, void *), | |
1201 | void *data) | |
d6b0e80f AC |
1202 | { |
1203 | struct lwp_info *lp, *lpnext; | |
1204 | ||
1205 | for (lp = lwp_list; lp; lp = lpnext) | |
1206 | { | |
1207 | lpnext = lp->next; | |
d90e17a7 PA |
1208 | |
1209 | if (ptid_match (lp->ptid, filter)) | |
1210 | { | |
1211 | if ((*callback) (lp, data)) | |
1212 | return lp; | |
1213 | } | |
d6b0e80f AC |
1214 | } |
1215 | ||
1216 | return NULL; | |
1217 | } | |
1218 | ||
2277426b PA |
1219 | /* Update our internal state when changing from one checkpoint to |
1220 | another indicated by NEW_PTID. We can only switch single-threaded | |
1221 | applications, so we only create one new LWP, and the previous list | |
1222 | is discarded. */ | |
f973ed9c DJ |
1223 | |
1224 | void | |
1225 | linux_nat_switch_fork (ptid_t new_ptid) | |
1226 | { | |
1227 | struct lwp_info *lp; | |
1228 | ||
2277426b PA |
1229 | purge_lwp_list (GET_PID (inferior_ptid)); |
1230 | ||
f973ed9c DJ |
1231 | lp = add_lwp (new_ptid); |
1232 | lp->stopped = 1; | |
e26af52f | 1233 | |
2277426b PA |
1234 | /* This changes the thread's ptid while preserving the gdb thread |
1235 | num. Also changes the inferior pid, while preserving the | |
1236 | inferior num. */ | |
1237 | thread_change_ptid (inferior_ptid, new_ptid); | |
1238 | ||
1239 | /* We've just told GDB core that the thread changed target id, but, | |
1240 | in fact, it really is a different thread, with different register | |
1241 | contents. */ | |
1242 | registers_changed (); | |
e26af52f DJ |
1243 | } |
1244 | ||
e26af52f DJ |
1245 | /* Handle the exit of a single thread LP. */ |
1246 | ||
1247 | static void | |
1248 | exit_lwp (struct lwp_info *lp) | |
1249 | { | |
e09875d4 | 1250 | struct thread_info *th = find_thread_ptid (lp->ptid); |
063bfe2e VP |
1251 | |
1252 | if (th) | |
e26af52f | 1253 | { |
17faa917 DJ |
1254 | if (print_thread_events) |
1255 | printf_unfiltered (_("[%s exited]\n"), target_pid_to_str (lp->ptid)); | |
1256 | ||
4f8d22e3 | 1257 | delete_thread (lp->ptid); |
e26af52f DJ |
1258 | } |
1259 | ||
1260 | delete_lwp (lp->ptid); | |
1261 | } | |
1262 | ||
a0ef4274 DJ |
1263 | /* Detect `T (stopped)' in `/proc/PID/status'. |
1264 | Other states including `T (tracing stop)' are reported as false. */ | |
1265 | ||
1266 | static int | |
1267 | pid_is_stopped (pid_t pid) | |
1268 | { | |
1269 | FILE *status_file; | |
1270 | char buf[100]; | |
1271 | int retval = 0; | |
1272 | ||
1273 | snprintf (buf, sizeof (buf), "/proc/%d/status", (int) pid); | |
1274 | status_file = fopen (buf, "r"); | |
1275 | if (status_file != NULL) | |
1276 | { | |
1277 | int have_state = 0; | |
1278 | ||
1279 | while (fgets (buf, sizeof (buf), status_file)) | |
1280 | { | |
1281 | if (strncmp (buf, "State:", 6) == 0) | |
1282 | { | |
1283 | have_state = 1; | |
1284 | break; | |
1285 | } | |
1286 | } | |
1287 | if (have_state && strstr (buf, "T (stopped)") != NULL) | |
1288 | retval = 1; | |
1289 | fclose (status_file); | |
1290 | } | |
1291 | return retval; | |
1292 | } | |
1293 | ||
1294 | /* Wait for the LWP specified by LP, which we have just attached to. | |
1295 | Returns a wait status for that LWP, to cache. */ | |
1296 | ||
1297 | static int | |
1298 | linux_nat_post_attach_wait (ptid_t ptid, int first, int *cloned, | |
1299 | int *signalled) | |
1300 | { | |
1301 | pid_t new_pid, pid = GET_LWP (ptid); | |
1302 | int status; | |
1303 | ||
1304 | if (pid_is_stopped (pid)) | |
1305 | { | |
1306 | if (debug_linux_nat) | |
1307 | fprintf_unfiltered (gdb_stdlog, | |
1308 | "LNPAW: Attaching to a stopped process\n"); | |
1309 | ||
1310 | /* The process is definitely stopped. It is in a job control | |
1311 | stop, unless the kernel predates the TASK_STOPPED / | |
1312 | TASK_TRACED distinction, in which case it might be in a | |
1313 | ptrace stop. Make sure it is in a ptrace stop; from there we | |
1314 | can kill it, signal it, et cetera. | |
1315 | ||
1316 | First make sure there is a pending SIGSTOP. Since we are | |
1317 | already attached, the process can not transition from stopped | |
1318 | to running without a PTRACE_CONT; so we know this signal will | |
1319 | go into the queue. The SIGSTOP generated by PTRACE_ATTACH is | |
1320 | probably already in the queue (unless this kernel is old | |
1321 | enough to use TASK_STOPPED for ptrace stops); but since SIGSTOP | |
1322 | is not an RT signal, it can only be queued once. */ | |
1323 | kill_lwp (pid, SIGSTOP); | |
1324 | ||
1325 | /* Finally, resume the stopped process. This will deliver the SIGSTOP | |
1326 | (or a higher priority signal, just like normal PTRACE_ATTACH). */ | |
1327 | ptrace (PTRACE_CONT, pid, 0, 0); | |
1328 | } | |
1329 | ||
1330 | /* Make sure the initial process is stopped. The user-level threads | |
1331 | layer might want to poke around in the inferior, and that won't | |
1332 | work if things haven't stabilized yet. */ | |
1333 | new_pid = my_waitpid (pid, &status, 0); | |
1334 | if (new_pid == -1 && errno == ECHILD) | |
1335 | { | |
1336 | if (first) | |
1337 | warning (_("%s is a cloned process"), target_pid_to_str (ptid)); | |
1338 | ||
1339 | /* Try again with __WCLONE to check cloned processes. */ | |
1340 | new_pid = my_waitpid (pid, &status, __WCLONE); | |
1341 | *cloned = 1; | |
1342 | } | |
1343 | ||
dacc9cb2 PP |
1344 | gdb_assert (pid == new_pid); |
1345 | ||
1346 | if (!WIFSTOPPED (status)) | |
1347 | { | |
1348 | /* The pid we tried to attach has apparently just exited. */ | |
1349 | if (debug_linux_nat) | |
1350 | fprintf_unfiltered (gdb_stdlog, "LNPAW: Failed to stop %d: %s", | |
1351 | pid, status_to_str (status)); | |
1352 | return status; | |
1353 | } | |
a0ef4274 DJ |
1354 | |
1355 | if (WSTOPSIG (status) != SIGSTOP) | |
1356 | { | |
1357 | *signalled = 1; | |
1358 | if (debug_linux_nat) | |
1359 | fprintf_unfiltered (gdb_stdlog, | |
1360 | "LNPAW: Received %s after attaching\n", | |
1361 | status_to_str (status)); | |
1362 | } | |
1363 | ||
1364 | return status; | |
1365 | } | |
1366 | ||
84636d28 PA |
1367 | /* Attach to the LWP specified by PID. Return 0 if successful, -1 if |
1368 | the new LWP could not be attached, or 1 if we're already auto | |
1369 | attached to this thread, but haven't processed the | |
1370 | PTRACE_EVENT_CLONE event of its parent thread, so we just ignore | |
1371 | its existance, without considering it an error. */ | |
d6b0e80f | 1372 | |
9ee57c33 | 1373 | int |
93815fbf | 1374 | lin_lwp_attach_lwp (ptid_t ptid) |
d6b0e80f | 1375 | { |
9ee57c33 | 1376 | struct lwp_info *lp; |
7feb7d06 | 1377 | sigset_t prev_mask; |
84636d28 | 1378 | int lwpid; |
d6b0e80f AC |
1379 | |
1380 | gdb_assert (is_lwp (ptid)); | |
1381 | ||
7feb7d06 | 1382 | block_child_signals (&prev_mask); |
d6b0e80f | 1383 | |
9ee57c33 | 1384 | lp = find_lwp_pid (ptid); |
84636d28 | 1385 | lwpid = GET_LWP (ptid); |
d6b0e80f AC |
1386 | |
1387 | /* We assume that we're already attached to any LWP that has an id | |
1388 | equal to the overall process id, and to any LWP that is already | |
1389 | in our list of LWPs. If we're not seeing exit events from threads | |
1390 | and we've had PID wraparound since we last tried to stop all threads, | |
1391 | this assumption might be wrong; fortunately, this is very unlikely | |
1392 | to happen. */ | |
84636d28 | 1393 | if (lwpid != GET_PID (ptid) && lp == NULL) |
d6b0e80f | 1394 | { |
a0ef4274 | 1395 | int status, cloned = 0, signalled = 0; |
d6b0e80f | 1396 | |
84636d28 | 1397 | if (ptrace (PTRACE_ATTACH, lwpid, 0, 0) < 0) |
9ee57c33 | 1398 | { |
84636d28 PA |
1399 | if (linux_supports_tracefork_flag) |
1400 | { | |
1401 | /* If we haven't stopped all threads when we get here, | |
1402 | we may have seen a thread listed in thread_db's list, | |
1403 | but not processed the PTRACE_EVENT_CLONE yet. If | |
1404 | that's the case, ignore this new thread, and let | |
1405 | normal event handling discover it later. */ | |
1406 | if (in_pid_list_p (stopped_pids, lwpid)) | |
1407 | { | |
1408 | /* We've already seen this thread stop, but we | |
1409 | haven't seen the PTRACE_EVENT_CLONE extended | |
1410 | event yet. */ | |
1411 | restore_child_signals_mask (&prev_mask); | |
1412 | return 0; | |
1413 | } | |
1414 | else | |
1415 | { | |
1416 | int new_pid; | |
1417 | int status; | |
1418 | ||
1419 | /* See if we've got a stop for this new child | |
1420 | pending. If so, we're already attached. */ | |
1421 | new_pid = my_waitpid (lwpid, &status, WNOHANG); | |
1422 | if (new_pid == -1 && errno == ECHILD) | |
1423 | new_pid = my_waitpid (lwpid, &status, __WCLONE | WNOHANG); | |
1424 | if (new_pid != -1) | |
1425 | { | |
1426 | if (WIFSTOPPED (status)) | |
1427 | add_to_pid_list (&stopped_pids, lwpid, status); | |
1428 | ||
1429 | restore_child_signals_mask (&prev_mask); | |
1430 | return 1; | |
1431 | } | |
1432 | } | |
1433 | } | |
1434 | ||
9ee57c33 DJ |
1435 | /* If we fail to attach to the thread, issue a warning, |
1436 | but continue. One way this can happen is if thread | |
e9efe249 | 1437 | creation is interrupted; as of Linux kernel 2.6.19, a |
9ee57c33 DJ |
1438 | bug may place threads in the thread list and then fail |
1439 | to create them. */ | |
1440 | warning (_("Can't attach %s: %s"), target_pid_to_str (ptid), | |
1441 | safe_strerror (errno)); | |
7feb7d06 | 1442 | restore_child_signals_mask (&prev_mask); |
9ee57c33 DJ |
1443 | return -1; |
1444 | } | |
1445 | ||
d6b0e80f AC |
1446 | if (debug_linux_nat) |
1447 | fprintf_unfiltered (gdb_stdlog, | |
1448 | "LLAL: PTRACE_ATTACH %s, 0, 0 (OK)\n", | |
1449 | target_pid_to_str (ptid)); | |
1450 | ||
a0ef4274 | 1451 | status = linux_nat_post_attach_wait (ptid, 0, &cloned, &signalled); |
dacc9cb2 | 1452 | if (!WIFSTOPPED (status)) |
673c2bbe DE |
1453 | { |
1454 | restore_child_signals_mask (&prev_mask); | |
f687d035 | 1455 | return 1; |
673c2bbe | 1456 | } |
dacc9cb2 | 1457 | |
a0ef4274 DJ |
1458 | lp = add_lwp (ptid); |
1459 | lp->stopped = 1; | |
1460 | lp->cloned = cloned; | |
1461 | lp->signalled = signalled; | |
1462 | if (WSTOPSIG (status) != SIGSTOP) | |
d6b0e80f | 1463 | { |
a0ef4274 DJ |
1464 | lp->resumed = 1; |
1465 | lp->status = status; | |
d6b0e80f AC |
1466 | } |
1467 | ||
a0ef4274 | 1468 | target_post_attach (GET_LWP (lp->ptid)); |
d6b0e80f AC |
1469 | |
1470 | if (debug_linux_nat) | |
1471 | { | |
1472 | fprintf_unfiltered (gdb_stdlog, | |
1473 | "LLAL: waitpid %s received %s\n", | |
1474 | target_pid_to_str (ptid), | |
1475 | status_to_str (status)); | |
1476 | } | |
1477 | } | |
1478 | else | |
1479 | { | |
1480 | /* We assume that the LWP representing the original process is | |
1481 | already stopped. Mark it as stopped in the data structure | |
155bd5d1 AC |
1482 | that the GNU/linux ptrace layer uses to keep track of |
1483 | threads. Note that this won't have already been done since | |
1484 | the main thread will have, we assume, been stopped by an | |
1485 | attach from a different layer. */ | |
9ee57c33 DJ |
1486 | if (lp == NULL) |
1487 | lp = add_lwp (ptid); | |
d6b0e80f AC |
1488 | lp->stopped = 1; |
1489 | } | |
9ee57c33 | 1490 | |
25289eb2 | 1491 | lp->last_resume_kind = resume_stop; |
7feb7d06 | 1492 | restore_child_signals_mask (&prev_mask); |
9ee57c33 | 1493 | return 0; |
d6b0e80f AC |
1494 | } |
1495 | ||
b84876c2 | 1496 | static void |
136d6dae VP |
1497 | linux_nat_create_inferior (struct target_ops *ops, |
1498 | char *exec_file, char *allargs, char **env, | |
b84876c2 PA |
1499 | int from_tty) |
1500 | { | |
10568435 JK |
1501 | #ifdef HAVE_PERSONALITY |
1502 | int personality_orig = 0, personality_set = 0; | |
1503 | #endif /* HAVE_PERSONALITY */ | |
b84876c2 PA |
1504 | |
1505 | /* The fork_child mechanism is synchronous and calls target_wait, so | |
1506 | we have to mask the async mode. */ | |
1507 | ||
10568435 JK |
1508 | #ifdef HAVE_PERSONALITY |
1509 | if (disable_randomization) | |
1510 | { | |
1511 | errno = 0; | |
1512 | personality_orig = personality (0xffffffff); | |
1513 | if (errno == 0 && !(personality_orig & ADDR_NO_RANDOMIZE)) | |
1514 | { | |
1515 | personality_set = 1; | |
1516 | personality (personality_orig | ADDR_NO_RANDOMIZE); | |
1517 | } | |
1518 | if (errno != 0 || (personality_set | |
1519 | && !(personality (0xffffffff) & ADDR_NO_RANDOMIZE))) | |
1520 | warning (_("Error disabling address space randomization: %s"), | |
1521 | safe_strerror (errno)); | |
1522 | } | |
1523 | #endif /* HAVE_PERSONALITY */ | |
1524 | ||
2455069d UW |
1525 | /* Make sure we report all signals during startup. */ |
1526 | linux_nat_pass_signals (0, NULL); | |
1527 | ||
136d6dae | 1528 | linux_ops->to_create_inferior (ops, exec_file, allargs, env, from_tty); |
b84876c2 | 1529 | |
10568435 JK |
1530 | #ifdef HAVE_PERSONALITY |
1531 | if (personality_set) | |
1532 | { | |
1533 | errno = 0; | |
1534 | personality (personality_orig); | |
1535 | if (errno != 0) | |
1536 | warning (_("Error restoring address space randomization: %s"), | |
1537 | safe_strerror (errno)); | |
1538 | } | |
1539 | #endif /* HAVE_PERSONALITY */ | |
b84876c2 PA |
1540 | } |
1541 | ||
d6b0e80f | 1542 | static void |
136d6dae | 1543 | linux_nat_attach (struct target_ops *ops, char *args, int from_tty) |
d6b0e80f AC |
1544 | { |
1545 | struct lwp_info *lp; | |
d6b0e80f | 1546 | int status; |
af990527 | 1547 | ptid_t ptid; |
d6b0e80f | 1548 | |
2455069d UW |
1549 | /* Make sure we report all signals during attach. */ |
1550 | linux_nat_pass_signals (0, NULL); | |
1551 | ||
136d6dae | 1552 | linux_ops->to_attach (ops, args, from_tty); |
d6b0e80f | 1553 | |
af990527 PA |
1554 | /* The ptrace base target adds the main thread with (pid,0,0) |
1555 | format. Decorate it with lwp info. */ | |
1556 | ptid = BUILD_LWP (GET_PID (inferior_ptid), GET_PID (inferior_ptid)); | |
1557 | thread_change_ptid (inferior_ptid, ptid); | |
1558 | ||
9f0bdab8 | 1559 | /* Add the initial process as the first LWP to the list. */ |
af990527 | 1560 | lp = add_lwp (ptid); |
a0ef4274 DJ |
1561 | |
1562 | status = linux_nat_post_attach_wait (lp->ptid, 1, &lp->cloned, | |
1563 | &lp->signalled); | |
dacc9cb2 PP |
1564 | if (!WIFSTOPPED (status)) |
1565 | { | |
1566 | if (WIFEXITED (status)) | |
1567 | { | |
1568 | int exit_code = WEXITSTATUS (status); | |
1569 | ||
1570 | target_terminal_ours (); | |
1571 | target_mourn_inferior (); | |
1572 | if (exit_code == 0) | |
1573 | error (_("Unable to attach: program exited normally.")); | |
1574 | else | |
1575 | error (_("Unable to attach: program exited with code %d."), | |
1576 | exit_code); | |
1577 | } | |
1578 | else if (WIFSIGNALED (status)) | |
1579 | { | |
1580 | enum target_signal signo; | |
1581 | ||
1582 | target_terminal_ours (); | |
1583 | target_mourn_inferior (); | |
1584 | ||
1585 | signo = target_signal_from_host (WTERMSIG (status)); | |
1586 | error (_("Unable to attach: program terminated with signal " | |
1587 | "%s, %s."), | |
1588 | target_signal_to_name (signo), | |
1589 | target_signal_to_string (signo)); | |
1590 | } | |
1591 | ||
1592 | internal_error (__FILE__, __LINE__, | |
1593 | _("unexpected status %d for PID %ld"), | |
1594 | status, (long) GET_LWP (ptid)); | |
1595 | } | |
1596 | ||
a0ef4274 | 1597 | lp->stopped = 1; |
9f0bdab8 | 1598 | |
a0ef4274 | 1599 | /* Save the wait status to report later. */ |
d6b0e80f | 1600 | lp->resumed = 1; |
a0ef4274 DJ |
1601 | if (debug_linux_nat) |
1602 | fprintf_unfiltered (gdb_stdlog, | |
1603 | "LNA: waitpid %ld, saving status %s\n", | |
1604 | (long) GET_PID (lp->ptid), status_to_str (status)); | |
710151dd | 1605 | |
7feb7d06 PA |
1606 | lp->status = status; |
1607 | ||
1608 | if (target_can_async_p ()) | |
1609 | target_async (inferior_event_handler, 0); | |
d6b0e80f AC |
1610 | } |
1611 | ||
a0ef4274 DJ |
1612 | /* Get pending status of LP. */ |
1613 | static int | |
1614 | get_pending_status (struct lwp_info *lp, int *status) | |
1615 | { | |
ca2163eb PA |
1616 | enum target_signal signo = TARGET_SIGNAL_0; |
1617 | ||
1618 | /* If we paused threads momentarily, we may have stored pending | |
1619 | events in lp->status or lp->waitstatus (see stop_wait_callback), | |
1620 | and GDB core hasn't seen any signal for those threads. | |
1621 | Otherwise, the last signal reported to the core is found in the | |
1622 | thread object's stop_signal. | |
1623 | ||
1624 | There's a corner case that isn't handled here at present. Only | |
1625 | if the thread stopped with a TARGET_WAITKIND_STOPPED does | |
1626 | stop_signal make sense as a real signal to pass to the inferior. | |
1627 | Some catchpoint related events, like | |
1628 | TARGET_WAITKIND_(V)FORK|EXEC|SYSCALL, have their stop_signal set | |
1629 | to TARGET_SIGNAL_SIGTRAP when the catchpoint triggers. But, | |
1630 | those traps are debug API (ptrace in our case) related and | |
1631 | induced; the inferior wouldn't see them if it wasn't being | |
1632 | traced. Hence, we should never pass them to the inferior, even | |
1633 | when set to pass state. Since this corner case isn't handled by | |
1634 | infrun.c when proceeding with a signal, for consistency, neither | |
1635 | do we handle it here (or elsewhere in the file we check for | |
1636 | signal pass state). Normally SIGTRAP isn't set to pass state, so | |
1637 | this is really a corner case. */ | |
1638 | ||
1639 | if (lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) | |
1640 | signo = TARGET_SIGNAL_0; /* a pending ptrace event, not a real signal. */ | |
1641 | else if (lp->status) | |
1642 | signo = target_signal_from_host (WSTOPSIG (lp->status)); | |
1643 | else if (non_stop && !is_executing (lp->ptid)) | |
1644 | { | |
1645 | struct thread_info *tp = find_thread_ptid (lp->ptid); | |
e0881a8e | 1646 | |
16c381f0 | 1647 | signo = tp->suspend.stop_signal; |
ca2163eb PA |
1648 | } |
1649 | else if (!non_stop) | |
a0ef4274 | 1650 | { |
ca2163eb PA |
1651 | struct target_waitstatus last; |
1652 | ptid_t last_ptid; | |
4c28f408 | 1653 | |
ca2163eb | 1654 | get_last_target_status (&last_ptid, &last); |
4c28f408 | 1655 | |
ca2163eb PA |
1656 | if (GET_LWP (lp->ptid) == GET_LWP (last_ptid)) |
1657 | { | |
e09875d4 | 1658 | struct thread_info *tp = find_thread_ptid (lp->ptid); |
e0881a8e | 1659 | |
16c381f0 | 1660 | signo = tp->suspend.stop_signal; |
4c28f408 | 1661 | } |
ca2163eb | 1662 | } |
4c28f408 | 1663 | |
ca2163eb | 1664 | *status = 0; |
4c28f408 | 1665 | |
ca2163eb PA |
1666 | if (signo == TARGET_SIGNAL_0) |
1667 | { | |
1668 | if (debug_linux_nat) | |
1669 | fprintf_unfiltered (gdb_stdlog, | |
1670 | "GPT: lwp %s has no pending signal\n", | |
1671 | target_pid_to_str (lp->ptid)); | |
1672 | } | |
1673 | else if (!signal_pass_state (signo)) | |
1674 | { | |
1675 | if (debug_linux_nat) | |
3e43a32a MS |
1676 | fprintf_unfiltered (gdb_stdlog, |
1677 | "GPT: lwp %s had signal %s, " | |
1678 | "but it is in no pass state\n", | |
ca2163eb PA |
1679 | target_pid_to_str (lp->ptid), |
1680 | target_signal_to_string (signo)); | |
a0ef4274 | 1681 | } |
a0ef4274 | 1682 | else |
4c28f408 | 1683 | { |
ca2163eb PA |
1684 | *status = W_STOPCODE (target_signal_to_host (signo)); |
1685 | ||
1686 | if (debug_linux_nat) | |
1687 | fprintf_unfiltered (gdb_stdlog, | |
1688 | "GPT: lwp %s has pending signal %s\n", | |
1689 | target_pid_to_str (lp->ptid), | |
1690 | target_signal_to_string (signo)); | |
4c28f408 | 1691 | } |
a0ef4274 DJ |
1692 | |
1693 | return 0; | |
1694 | } | |
1695 | ||
d6b0e80f AC |
1696 | static int |
1697 | detach_callback (struct lwp_info *lp, void *data) | |
1698 | { | |
1699 | gdb_assert (lp->status == 0 || WIFSTOPPED (lp->status)); | |
1700 | ||
1701 | if (debug_linux_nat && lp->status) | |
1702 | fprintf_unfiltered (gdb_stdlog, "DC: Pending %s for %s on detach.\n", | |
1703 | strsignal (WSTOPSIG (lp->status)), | |
1704 | target_pid_to_str (lp->ptid)); | |
1705 | ||
a0ef4274 DJ |
1706 | /* If there is a pending SIGSTOP, get rid of it. */ |
1707 | if (lp->signalled) | |
d6b0e80f | 1708 | { |
d6b0e80f AC |
1709 | if (debug_linux_nat) |
1710 | fprintf_unfiltered (gdb_stdlog, | |
a0ef4274 DJ |
1711 | "DC: Sending SIGCONT to %s\n", |
1712 | target_pid_to_str (lp->ptid)); | |
d6b0e80f | 1713 | |
a0ef4274 | 1714 | kill_lwp (GET_LWP (lp->ptid), SIGCONT); |
d6b0e80f | 1715 | lp->signalled = 0; |
d6b0e80f AC |
1716 | } |
1717 | ||
1718 | /* We don't actually detach from the LWP that has an id equal to the | |
1719 | overall process id just yet. */ | |
1720 | if (GET_LWP (lp->ptid) != GET_PID (lp->ptid)) | |
1721 | { | |
a0ef4274 DJ |
1722 | int status = 0; |
1723 | ||
1724 | /* Pass on any pending signal for this LWP. */ | |
1725 | get_pending_status (lp, &status); | |
1726 | ||
d6b0e80f AC |
1727 | errno = 0; |
1728 | if (ptrace (PTRACE_DETACH, GET_LWP (lp->ptid), 0, | |
a0ef4274 | 1729 | WSTOPSIG (status)) < 0) |
8a3fe4f8 | 1730 | error (_("Can't detach %s: %s"), target_pid_to_str (lp->ptid), |
d6b0e80f AC |
1731 | safe_strerror (errno)); |
1732 | ||
1733 | if (debug_linux_nat) | |
1734 | fprintf_unfiltered (gdb_stdlog, | |
1735 | "PTRACE_DETACH (%s, %s, 0) (OK)\n", | |
1736 | target_pid_to_str (lp->ptid), | |
7feb7d06 | 1737 | strsignal (WSTOPSIG (status))); |
d6b0e80f AC |
1738 | |
1739 | delete_lwp (lp->ptid); | |
1740 | } | |
1741 | ||
1742 | return 0; | |
1743 | } | |
1744 | ||
1745 | static void | |
136d6dae | 1746 | linux_nat_detach (struct target_ops *ops, char *args, int from_tty) |
d6b0e80f | 1747 | { |
b84876c2 | 1748 | int pid; |
a0ef4274 | 1749 | int status; |
d90e17a7 PA |
1750 | struct lwp_info *main_lwp; |
1751 | ||
1752 | pid = GET_PID (inferior_ptid); | |
a0ef4274 | 1753 | |
b84876c2 PA |
1754 | if (target_can_async_p ()) |
1755 | linux_nat_async (NULL, 0); | |
1756 | ||
4c28f408 PA |
1757 | /* Stop all threads before detaching. ptrace requires that the |
1758 | thread is stopped to sucessfully detach. */ | |
d90e17a7 | 1759 | iterate_over_lwps (pid_to_ptid (pid), stop_callback, NULL); |
4c28f408 PA |
1760 | /* ... and wait until all of them have reported back that |
1761 | they're no longer running. */ | |
d90e17a7 | 1762 | iterate_over_lwps (pid_to_ptid (pid), stop_wait_callback, NULL); |
4c28f408 | 1763 | |
d90e17a7 | 1764 | iterate_over_lwps (pid_to_ptid (pid), detach_callback, NULL); |
d6b0e80f AC |
1765 | |
1766 | /* Only the initial process should be left right now. */ | |
d90e17a7 PA |
1767 | gdb_assert (num_lwps (GET_PID (inferior_ptid)) == 1); |
1768 | ||
1769 | main_lwp = find_lwp_pid (pid_to_ptid (pid)); | |
d6b0e80f | 1770 | |
a0ef4274 DJ |
1771 | /* Pass on any pending signal for the last LWP. */ |
1772 | if ((args == NULL || *args == '\0') | |
d90e17a7 | 1773 | && get_pending_status (main_lwp, &status) != -1 |
a0ef4274 DJ |
1774 | && WIFSTOPPED (status)) |
1775 | { | |
1776 | /* Put the signal number in ARGS so that inf_ptrace_detach will | |
1777 | pass it along with PTRACE_DETACH. */ | |
1778 | args = alloca (8); | |
1779 | sprintf (args, "%d", (int) WSTOPSIG (status)); | |
ddabfc73 TT |
1780 | if (debug_linux_nat) |
1781 | fprintf_unfiltered (gdb_stdlog, | |
1782 | "LND: Sending signal %s to %s\n", | |
1783 | args, | |
1784 | target_pid_to_str (main_lwp->ptid)); | |
a0ef4274 DJ |
1785 | } |
1786 | ||
d90e17a7 | 1787 | delete_lwp (main_lwp->ptid); |
b84876c2 | 1788 | |
7a7d3353 PA |
1789 | if (forks_exist_p ()) |
1790 | { | |
1791 | /* Multi-fork case. The current inferior_ptid is being detached | |
1792 | from, but there are other viable forks to debug. Detach from | |
1793 | the current fork, and context-switch to the first | |
1794 | available. */ | |
1795 | linux_fork_detach (args, from_tty); | |
1796 | ||
1797 | if (non_stop && target_can_async_p ()) | |
1798 | target_async (inferior_event_handler, 0); | |
1799 | } | |
1800 | else | |
1801 | linux_ops->to_detach (ops, args, from_tty); | |
d6b0e80f AC |
1802 | } |
1803 | ||
1804 | /* Resume LP. */ | |
1805 | ||
25289eb2 PA |
1806 | static void |
1807 | resume_lwp (struct lwp_info *lp, int step) | |
d6b0e80f | 1808 | { |
25289eb2 | 1809 | if (lp->stopped) |
6c95b8df | 1810 | { |
25289eb2 PA |
1811 | struct inferior *inf = find_inferior_pid (GET_PID (lp->ptid)); |
1812 | ||
1813 | if (inf->vfork_child != NULL) | |
1814 | { | |
1815 | if (debug_linux_nat) | |
1816 | fprintf_unfiltered (gdb_stdlog, | |
1817 | "RC: Not resuming %s (vfork parent)\n", | |
1818 | target_pid_to_str (lp->ptid)); | |
1819 | } | |
1820 | else if (lp->status == 0 | |
1821 | && lp->waitstatus.kind == TARGET_WAITKIND_IGNORE) | |
1822 | { | |
1823 | if (debug_linux_nat) | |
1824 | fprintf_unfiltered (gdb_stdlog, | |
1825 | "RC: PTRACE_CONT %s, 0, 0 (resuming sibling)\n", | |
1826 | target_pid_to_str (lp->ptid)); | |
1827 | ||
1828 | linux_ops->to_resume (linux_ops, | |
1829 | pid_to_ptid (GET_LWP (lp->ptid)), | |
1830 | step, TARGET_SIGNAL_0); | |
25289eb2 PA |
1831 | lp->stopped = 0; |
1832 | lp->step = step; | |
1833 | memset (&lp->siginfo, 0, sizeof (lp->siginfo)); | |
1834 | lp->stopped_by_watchpoint = 0; | |
1835 | } | |
1836 | else | |
1837 | { | |
1838 | if (debug_linux_nat) | |
1839 | fprintf_unfiltered (gdb_stdlog, | |
1840 | "RC: Not resuming sibling %s (has pending)\n", | |
1841 | target_pid_to_str (lp->ptid)); | |
1842 | } | |
6c95b8df | 1843 | } |
25289eb2 | 1844 | else |
d6b0e80f | 1845 | { |
d90e17a7 PA |
1846 | if (debug_linux_nat) |
1847 | fprintf_unfiltered (gdb_stdlog, | |
25289eb2 | 1848 | "RC: Not resuming sibling %s (not stopped)\n", |
d6b0e80f | 1849 | target_pid_to_str (lp->ptid)); |
d6b0e80f | 1850 | } |
25289eb2 | 1851 | } |
d6b0e80f | 1852 | |
25289eb2 PA |
1853 | static int |
1854 | resume_callback (struct lwp_info *lp, void *data) | |
1855 | { | |
1856 | resume_lwp (lp, 0); | |
d6b0e80f AC |
1857 | return 0; |
1858 | } | |
1859 | ||
1860 | static int | |
1861 | resume_clear_callback (struct lwp_info *lp, void *data) | |
1862 | { | |
1863 | lp->resumed = 0; | |
25289eb2 | 1864 | lp->last_resume_kind = resume_stop; |
d6b0e80f AC |
1865 | return 0; |
1866 | } | |
1867 | ||
1868 | static int | |
1869 | resume_set_callback (struct lwp_info *lp, void *data) | |
1870 | { | |
1871 | lp->resumed = 1; | |
25289eb2 | 1872 | lp->last_resume_kind = resume_continue; |
d6b0e80f AC |
1873 | return 0; |
1874 | } | |
1875 | ||
1876 | static void | |
28439f5e PA |
1877 | linux_nat_resume (struct target_ops *ops, |
1878 | ptid_t ptid, int step, enum target_signal signo) | |
d6b0e80f | 1879 | { |
7feb7d06 | 1880 | sigset_t prev_mask; |
d6b0e80f | 1881 | struct lwp_info *lp; |
d90e17a7 | 1882 | int resume_many; |
d6b0e80f | 1883 | |
76f50ad1 DJ |
1884 | if (debug_linux_nat) |
1885 | fprintf_unfiltered (gdb_stdlog, | |
1886 | "LLR: Preparing to %s %s, %s, inferior_ptid %s\n", | |
1887 | step ? "step" : "resume", | |
1888 | target_pid_to_str (ptid), | |
423ec54c JK |
1889 | (signo != TARGET_SIGNAL_0 |
1890 | ? strsignal (target_signal_to_host (signo)) : "0"), | |
76f50ad1 DJ |
1891 | target_pid_to_str (inferior_ptid)); |
1892 | ||
7feb7d06 | 1893 | block_child_signals (&prev_mask); |
b84876c2 | 1894 | |
d6b0e80f | 1895 | /* A specific PTID means `step only this process id'. */ |
d90e17a7 PA |
1896 | resume_many = (ptid_equal (minus_one_ptid, ptid) |
1897 | || ptid_is_pid (ptid)); | |
4c28f408 | 1898 | |
e3e9f5a2 PA |
1899 | /* Mark the lwps we're resuming as resumed. */ |
1900 | iterate_over_lwps (ptid, resume_set_callback, NULL); | |
d6b0e80f | 1901 | |
d90e17a7 PA |
1902 | /* See if it's the current inferior that should be handled |
1903 | specially. */ | |
1904 | if (resume_many) | |
1905 | lp = find_lwp_pid (inferior_ptid); | |
1906 | else | |
1907 | lp = find_lwp_pid (ptid); | |
9f0bdab8 | 1908 | gdb_assert (lp != NULL); |
d6b0e80f | 1909 | |
9f0bdab8 DJ |
1910 | /* Remember if we're stepping. */ |
1911 | lp->step = step; | |
25289eb2 | 1912 | lp->last_resume_kind = step ? resume_step : resume_continue; |
d6b0e80f | 1913 | |
9f0bdab8 DJ |
1914 | /* If we have a pending wait status for this thread, there is no |
1915 | point in resuming the process. But first make sure that | |
1916 | linux_nat_wait won't preemptively handle the event - we | |
1917 | should never take this short-circuit if we are going to | |
1918 | leave LP running, since we have skipped resuming all the | |
1919 | other threads. This bit of code needs to be synchronized | |
1920 | with linux_nat_wait. */ | |
76f50ad1 | 1921 | |
9f0bdab8 DJ |
1922 | if (lp->status && WIFSTOPPED (lp->status)) |
1923 | { | |
2455069d UW |
1924 | if (!lp->step |
1925 | && WSTOPSIG (lp->status) | |
1926 | && sigismember (&pass_mask, WSTOPSIG (lp->status))) | |
d6b0e80f | 1927 | { |
9f0bdab8 DJ |
1928 | if (debug_linux_nat) |
1929 | fprintf_unfiltered (gdb_stdlog, | |
1930 | "LLR: Not short circuiting for ignored " | |
1931 | "status 0x%x\n", lp->status); | |
1932 | ||
d6b0e80f AC |
1933 | /* FIXME: What should we do if we are supposed to continue |
1934 | this thread with a signal? */ | |
1935 | gdb_assert (signo == TARGET_SIGNAL_0); | |
2455069d | 1936 | signo = target_signal_from_host (WSTOPSIG (lp->status)); |
9f0bdab8 DJ |
1937 | lp->status = 0; |
1938 | } | |
1939 | } | |
76f50ad1 | 1940 | |
6c95b8df | 1941 | if (lp->status || lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) |
9f0bdab8 DJ |
1942 | { |
1943 | /* FIXME: What should we do if we are supposed to continue | |
1944 | this thread with a signal? */ | |
1945 | gdb_assert (signo == TARGET_SIGNAL_0); | |
76f50ad1 | 1946 | |
9f0bdab8 DJ |
1947 | if (debug_linux_nat) |
1948 | fprintf_unfiltered (gdb_stdlog, | |
1949 | "LLR: Short circuiting for status 0x%x\n", | |
1950 | lp->status); | |
d6b0e80f | 1951 | |
7feb7d06 PA |
1952 | restore_child_signals_mask (&prev_mask); |
1953 | if (target_can_async_p ()) | |
1954 | { | |
1955 | target_async (inferior_event_handler, 0); | |
1956 | /* Tell the event loop we have something to process. */ | |
1957 | async_file_mark (); | |
1958 | } | |
9f0bdab8 | 1959 | return; |
d6b0e80f AC |
1960 | } |
1961 | ||
9f0bdab8 DJ |
1962 | /* Mark LWP as not stopped to prevent it from being continued by |
1963 | resume_callback. */ | |
1964 | lp->stopped = 0; | |
1965 | ||
d90e17a7 PA |
1966 | if (resume_many) |
1967 | iterate_over_lwps (ptid, resume_callback, NULL); | |
1968 | ||
1969 | /* Convert to something the lower layer understands. */ | |
1970 | ptid = pid_to_ptid (GET_LWP (lp->ptid)); | |
d6b0e80f | 1971 | |
28439f5e | 1972 | linux_ops->to_resume (linux_ops, ptid, step, signo); |
9f0bdab8 | 1973 | memset (&lp->siginfo, 0, sizeof (lp->siginfo)); |
ebec9a0f | 1974 | lp->stopped_by_watchpoint = 0; |
9f0bdab8 | 1975 | |
d6b0e80f AC |
1976 | if (debug_linux_nat) |
1977 | fprintf_unfiltered (gdb_stdlog, | |
1978 | "LLR: %s %s, %s (resume event thread)\n", | |
1979 | step ? "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
1980 | target_pid_to_str (ptid), | |
423ec54c JK |
1981 | (signo != TARGET_SIGNAL_0 |
1982 | ? strsignal (target_signal_to_host (signo)) : "0")); | |
b84876c2 | 1983 | |
7feb7d06 | 1984 | restore_child_signals_mask (&prev_mask); |
b84876c2 | 1985 | if (target_can_async_p ()) |
8ea051c5 | 1986 | target_async (inferior_event_handler, 0); |
d6b0e80f AC |
1987 | } |
1988 | ||
c5f62d5f | 1989 | /* Send a signal to an LWP. */ |
d6b0e80f AC |
1990 | |
1991 | static int | |
1992 | kill_lwp (int lwpid, int signo) | |
1993 | { | |
c5f62d5f DE |
1994 | /* Use tkill, if possible, in case we are using nptl threads. If tkill |
1995 | fails, then we are not using nptl threads and we should be using kill. */ | |
d6b0e80f AC |
1996 | |
1997 | #ifdef HAVE_TKILL_SYSCALL | |
c5f62d5f DE |
1998 | { |
1999 | static int tkill_failed; | |
2000 | ||
2001 | if (!tkill_failed) | |
2002 | { | |
2003 | int ret; | |
2004 | ||
2005 | errno = 0; | |
2006 | ret = syscall (__NR_tkill, lwpid, signo); | |
2007 | if (errno != ENOSYS) | |
2008 | return ret; | |
2009 | tkill_failed = 1; | |
2010 | } | |
2011 | } | |
d6b0e80f AC |
2012 | #endif |
2013 | ||
2014 | return kill (lwpid, signo); | |
2015 | } | |
2016 | ||
ca2163eb PA |
2017 | /* Handle a GNU/Linux syscall trap wait response. If we see a syscall |
2018 | event, check if the core is interested in it: if not, ignore the | |
2019 | event, and keep waiting; otherwise, we need to toggle the LWP's | |
2020 | syscall entry/exit status, since the ptrace event itself doesn't | |
2021 | indicate it, and report the trap to higher layers. */ | |
2022 | ||
2023 | static int | |
2024 | linux_handle_syscall_trap (struct lwp_info *lp, int stopping) | |
2025 | { | |
2026 | struct target_waitstatus *ourstatus = &lp->waitstatus; | |
2027 | struct gdbarch *gdbarch = target_thread_architecture (lp->ptid); | |
2028 | int syscall_number = (int) gdbarch_get_syscall_number (gdbarch, lp->ptid); | |
2029 | ||
2030 | if (stopping) | |
2031 | { | |
2032 | /* If we're stopping threads, there's a SIGSTOP pending, which | |
2033 | makes it so that the LWP reports an immediate syscall return, | |
2034 | followed by the SIGSTOP. Skip seeing that "return" using | |
2035 | PTRACE_CONT directly, and let stop_wait_callback collect the | |
2036 | SIGSTOP. Later when the thread is resumed, a new syscall | |
2037 | entry event. If we didn't do this (and returned 0), we'd | |
2038 | leave a syscall entry pending, and our caller, by using | |
2039 | PTRACE_CONT to collect the SIGSTOP, skips the syscall return | |
2040 | itself. Later, when the user re-resumes this LWP, we'd see | |
2041 | another syscall entry event and we'd mistake it for a return. | |
2042 | ||
2043 | If stop_wait_callback didn't force the SIGSTOP out of the LWP | |
2044 | (leaving immediately with LWP->signalled set, without issuing | |
2045 | a PTRACE_CONT), it would still be problematic to leave this | |
2046 | syscall enter pending, as later when the thread is resumed, | |
2047 | it would then see the same syscall exit mentioned above, | |
2048 | followed by the delayed SIGSTOP, while the syscall didn't | |
2049 | actually get to execute. It seems it would be even more | |
2050 | confusing to the user. */ | |
2051 | ||
2052 | if (debug_linux_nat) | |
2053 | fprintf_unfiltered (gdb_stdlog, | |
2054 | "LHST: ignoring syscall %d " | |
2055 | "for LWP %ld (stopping threads), " | |
2056 | "resuming with PTRACE_CONT for SIGSTOP\n", | |
2057 | syscall_number, | |
2058 | GET_LWP (lp->ptid)); | |
2059 | ||
2060 | lp->syscall_state = TARGET_WAITKIND_IGNORE; | |
2061 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2062 | return 1; | |
2063 | } | |
2064 | ||
2065 | if (catch_syscall_enabled ()) | |
2066 | { | |
2067 | /* Always update the entry/return state, even if this particular | |
2068 | syscall isn't interesting to the core now. In async mode, | |
2069 | the user could install a new catchpoint for this syscall | |
2070 | between syscall enter/return, and we'll need to know to | |
2071 | report a syscall return if that happens. */ | |
2072 | lp->syscall_state = (lp->syscall_state == TARGET_WAITKIND_SYSCALL_ENTRY | |
2073 | ? TARGET_WAITKIND_SYSCALL_RETURN | |
2074 | : TARGET_WAITKIND_SYSCALL_ENTRY); | |
2075 | ||
2076 | if (catching_syscall_number (syscall_number)) | |
2077 | { | |
2078 | /* Alright, an event to report. */ | |
2079 | ourstatus->kind = lp->syscall_state; | |
2080 | ourstatus->value.syscall_number = syscall_number; | |
2081 | ||
2082 | if (debug_linux_nat) | |
2083 | fprintf_unfiltered (gdb_stdlog, | |
2084 | "LHST: stopping for %s of syscall %d" | |
2085 | " for LWP %ld\n", | |
3e43a32a MS |
2086 | lp->syscall_state |
2087 | == TARGET_WAITKIND_SYSCALL_ENTRY | |
ca2163eb PA |
2088 | ? "entry" : "return", |
2089 | syscall_number, | |
2090 | GET_LWP (lp->ptid)); | |
2091 | return 0; | |
2092 | } | |
2093 | ||
2094 | if (debug_linux_nat) | |
2095 | fprintf_unfiltered (gdb_stdlog, | |
2096 | "LHST: ignoring %s of syscall %d " | |
2097 | "for LWP %ld\n", | |
2098 | lp->syscall_state == TARGET_WAITKIND_SYSCALL_ENTRY | |
2099 | ? "entry" : "return", | |
2100 | syscall_number, | |
2101 | GET_LWP (lp->ptid)); | |
2102 | } | |
2103 | else | |
2104 | { | |
2105 | /* If we had been syscall tracing, and hence used PT_SYSCALL | |
2106 | before on this LWP, it could happen that the user removes all | |
2107 | syscall catchpoints before we get to process this event. | |
2108 | There are two noteworthy issues here: | |
2109 | ||
2110 | - When stopped at a syscall entry event, resuming with | |
2111 | PT_STEP still resumes executing the syscall and reports a | |
2112 | syscall return. | |
2113 | ||
2114 | - Only PT_SYSCALL catches syscall enters. If we last | |
2115 | single-stepped this thread, then this event can't be a | |
2116 | syscall enter. If we last single-stepped this thread, this | |
2117 | has to be a syscall exit. | |
2118 | ||
2119 | The points above mean that the next resume, be it PT_STEP or | |
2120 | PT_CONTINUE, can not trigger a syscall trace event. */ | |
2121 | if (debug_linux_nat) | |
2122 | fprintf_unfiltered (gdb_stdlog, | |
3e43a32a MS |
2123 | "LHST: caught syscall event " |
2124 | "with no syscall catchpoints." | |
ca2163eb PA |
2125 | " %d for LWP %ld, ignoring\n", |
2126 | syscall_number, | |
2127 | GET_LWP (lp->ptid)); | |
2128 | lp->syscall_state = TARGET_WAITKIND_IGNORE; | |
2129 | } | |
2130 | ||
2131 | /* The core isn't interested in this event. For efficiency, avoid | |
2132 | stopping all threads only to have the core resume them all again. | |
2133 | Since we're not stopping threads, if we're still syscall tracing | |
2134 | and not stepping, we can't use PTRACE_CONT here, as we'd miss any | |
2135 | subsequent syscall. Simply resume using the inf-ptrace layer, | |
2136 | which knows when to use PT_SYSCALL or PT_CONTINUE. */ | |
2137 | ||
2138 | /* Note that gdbarch_get_syscall_number may access registers, hence | |
2139 | fill a regcache. */ | |
2140 | registers_changed (); | |
2141 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), | |
2142 | lp->step, TARGET_SIGNAL_0); | |
2143 | return 1; | |
2144 | } | |
2145 | ||
3d799a95 DJ |
2146 | /* Handle a GNU/Linux extended wait response. If we see a clone |
2147 | event, we need to add the new LWP to our list (and not report the | |
2148 | trap to higher layers). This function returns non-zero if the | |
2149 | event should be ignored and we should wait again. If STOPPING is | |
2150 | true, the new LWP remains stopped, otherwise it is continued. */ | |
d6b0e80f AC |
2151 | |
2152 | static int | |
3d799a95 DJ |
2153 | linux_handle_extended_wait (struct lwp_info *lp, int status, |
2154 | int stopping) | |
d6b0e80f | 2155 | { |
3d799a95 DJ |
2156 | int pid = GET_LWP (lp->ptid); |
2157 | struct target_waitstatus *ourstatus = &lp->waitstatus; | |
3d799a95 | 2158 | int event = status >> 16; |
d6b0e80f | 2159 | |
3d799a95 DJ |
2160 | if (event == PTRACE_EVENT_FORK || event == PTRACE_EVENT_VFORK |
2161 | || event == PTRACE_EVENT_CLONE) | |
d6b0e80f | 2162 | { |
3d799a95 DJ |
2163 | unsigned long new_pid; |
2164 | int ret; | |
2165 | ||
2166 | ptrace (PTRACE_GETEVENTMSG, pid, 0, &new_pid); | |
6fc19103 | 2167 | |
3d799a95 DJ |
2168 | /* If we haven't already seen the new PID stop, wait for it now. */ |
2169 | if (! pull_pid_from_list (&stopped_pids, new_pid, &status)) | |
2170 | { | |
2171 | /* The new child has a pending SIGSTOP. We can't affect it until it | |
2172 | hits the SIGSTOP, but we're already attached. */ | |
2173 | ret = my_waitpid (new_pid, &status, | |
2174 | (event == PTRACE_EVENT_CLONE) ? __WCLONE : 0); | |
2175 | if (ret == -1) | |
2176 | perror_with_name (_("waiting for new child")); | |
2177 | else if (ret != new_pid) | |
2178 | internal_error (__FILE__, __LINE__, | |
2179 | _("wait returned unexpected PID %d"), ret); | |
2180 | else if (!WIFSTOPPED (status)) | |
2181 | internal_error (__FILE__, __LINE__, | |
2182 | _("wait returned unexpected status 0x%x"), status); | |
2183 | } | |
2184 | ||
3a3e9ee3 | 2185 | ourstatus->value.related_pid = ptid_build (new_pid, new_pid, 0); |
3d799a95 | 2186 | |
2277426b PA |
2187 | if (event == PTRACE_EVENT_FORK |
2188 | && linux_fork_checkpointing_p (GET_PID (lp->ptid))) | |
2189 | { | |
2277426b PA |
2190 | /* Handle checkpointing by linux-fork.c here as a special |
2191 | case. We don't want the follow-fork-mode or 'catch fork' | |
2192 | to interfere with this. */ | |
2193 | ||
2194 | /* This won't actually modify the breakpoint list, but will | |
2195 | physically remove the breakpoints from the child. */ | |
2196 | detach_breakpoints (new_pid); | |
2197 | ||
2198 | /* Retain child fork in ptrace (stopped) state. */ | |
14571dad MS |
2199 | if (!find_fork_pid (new_pid)) |
2200 | add_fork (new_pid); | |
2277426b PA |
2201 | |
2202 | /* Report as spurious, so that infrun doesn't want to follow | |
2203 | this fork. We're actually doing an infcall in | |
2204 | linux-fork.c. */ | |
2205 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; | |
2206 | linux_enable_event_reporting (pid_to_ptid (new_pid)); | |
2207 | ||
2208 | /* Report the stop to the core. */ | |
2209 | return 0; | |
2210 | } | |
2211 | ||
3d799a95 DJ |
2212 | if (event == PTRACE_EVENT_FORK) |
2213 | ourstatus->kind = TARGET_WAITKIND_FORKED; | |
2214 | else if (event == PTRACE_EVENT_VFORK) | |
2215 | ourstatus->kind = TARGET_WAITKIND_VFORKED; | |
6fc19103 | 2216 | else |
3d799a95 | 2217 | { |
78768c4a JK |
2218 | struct lwp_info *new_lp; |
2219 | ||
3d799a95 | 2220 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
78768c4a | 2221 | |
3c4d7e12 PA |
2222 | if (debug_linux_nat) |
2223 | fprintf_unfiltered (gdb_stdlog, | |
2224 | "LHEW: Got clone event " | |
2225 | "from LWP %d, new child is LWP %ld\n", | |
2226 | pid, new_pid); | |
2227 | ||
d90e17a7 | 2228 | new_lp = add_lwp (BUILD_LWP (new_pid, GET_PID (lp->ptid))); |
3d799a95 | 2229 | new_lp->cloned = 1; |
4c28f408 | 2230 | new_lp->stopped = 1; |
d6b0e80f | 2231 | |
3d799a95 DJ |
2232 | if (WSTOPSIG (status) != SIGSTOP) |
2233 | { | |
2234 | /* This can happen if someone starts sending signals to | |
2235 | the new thread before it gets a chance to run, which | |
2236 | have a lower number than SIGSTOP (e.g. SIGUSR1). | |
2237 | This is an unlikely case, and harder to handle for | |
2238 | fork / vfork than for clone, so we do not try - but | |
2239 | we handle it for clone events here. We'll send | |
2240 | the other signal on to the thread below. */ | |
2241 | ||
2242 | new_lp->signalled = 1; | |
2243 | } | |
2244 | else | |
79395f92 PA |
2245 | { |
2246 | struct thread_info *tp; | |
2247 | ||
2248 | /* When we stop for an event in some other thread, and | |
2249 | pull the thread list just as this thread has cloned, | |
2250 | we'll have seen the new thread in the thread_db list | |
2251 | before handling the CLONE event (glibc's | |
2252 | pthread_create adds the new thread to the thread list | |
2253 | before clone'ing, and has the kernel fill in the | |
2254 | thread's tid on the clone call with | |
2255 | CLONE_PARENT_SETTID). If that happened, and the core | |
2256 | had requested the new thread to stop, we'll have | |
2257 | killed it with SIGSTOP. But since SIGSTOP is not an | |
2258 | RT signal, it can only be queued once. We need to be | |
2259 | careful to not resume the LWP if we wanted it to | |
2260 | stop. In that case, we'll leave the SIGSTOP pending. | |
2261 | It will later be reported as TARGET_SIGNAL_0. */ | |
2262 | tp = find_thread_ptid (new_lp->ptid); | |
2263 | if (tp != NULL && tp->stop_requested) | |
2264 | new_lp->last_resume_kind = resume_stop; | |
2265 | else | |
2266 | status = 0; | |
2267 | } | |
d6b0e80f | 2268 | |
4c28f408 | 2269 | if (non_stop) |
3d799a95 | 2270 | { |
4c28f408 PA |
2271 | /* Add the new thread to GDB's lists as soon as possible |
2272 | so that: | |
2273 | ||
2274 | 1) the frontend doesn't have to wait for a stop to | |
2275 | display them, and, | |
2276 | ||
2277 | 2) we tag it with the correct running state. */ | |
2278 | ||
2279 | /* If the thread_db layer is active, let it know about | |
2280 | this new thread, and add it to GDB's list. */ | |
2281 | if (!thread_db_attach_lwp (new_lp->ptid)) | |
2282 | { | |
2283 | /* We're not using thread_db. Add it to GDB's | |
2284 | list. */ | |
2285 | target_post_attach (GET_LWP (new_lp->ptid)); | |
2286 | add_thread (new_lp->ptid); | |
2287 | } | |
2288 | ||
2289 | if (!stopping) | |
2290 | { | |
2291 | set_running (new_lp->ptid, 1); | |
2292 | set_executing (new_lp->ptid, 1); | |
e21ffe51 PA |
2293 | /* thread_db_attach_lwp -> lin_lwp_attach_lwp forced |
2294 | resume_stop. */ | |
2295 | new_lp->last_resume_kind = resume_continue; | |
4c28f408 PA |
2296 | } |
2297 | } | |
2298 | ||
79395f92 PA |
2299 | if (status != 0) |
2300 | { | |
2301 | /* We created NEW_LP so it cannot yet contain STATUS. */ | |
2302 | gdb_assert (new_lp->status == 0); | |
2303 | ||
2304 | /* Save the wait status to report later. */ | |
2305 | if (debug_linux_nat) | |
2306 | fprintf_unfiltered (gdb_stdlog, | |
2307 | "LHEW: waitpid of new LWP %ld, " | |
2308 | "saving status %s\n", | |
2309 | (long) GET_LWP (new_lp->ptid), | |
2310 | status_to_str (status)); | |
2311 | new_lp->status = status; | |
2312 | } | |
2313 | ||
ca2163eb PA |
2314 | /* Note the need to use the low target ops to resume, to |
2315 | handle resuming with PT_SYSCALL if we have syscall | |
2316 | catchpoints. */ | |
4c28f408 PA |
2317 | if (!stopping) |
2318 | { | |
3d799a95 | 2319 | new_lp->resumed = 1; |
ca2163eb | 2320 | |
79395f92 | 2321 | if (status == 0) |
ad34eb2f | 2322 | { |
e21ffe51 | 2323 | gdb_assert (new_lp->last_resume_kind == resume_continue); |
ad34eb2f JK |
2324 | if (debug_linux_nat) |
2325 | fprintf_unfiltered (gdb_stdlog, | |
79395f92 PA |
2326 | "LHEW: resuming new LWP %ld\n", |
2327 | GET_LWP (new_lp->ptid)); | |
2328 | linux_ops->to_resume (linux_ops, pid_to_ptid (new_pid), | |
2329 | 0, TARGET_SIGNAL_0); | |
2330 | new_lp->stopped = 0; | |
ad34eb2f JK |
2331 | } |
2332 | } | |
d6b0e80f | 2333 | |
3d799a95 DJ |
2334 | if (debug_linux_nat) |
2335 | fprintf_unfiltered (gdb_stdlog, | |
3c4d7e12 | 2336 | "LHEW: resuming parent LWP %d\n", pid); |
ca2163eb PA |
2337 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
2338 | 0, TARGET_SIGNAL_0); | |
3d799a95 DJ |
2339 | |
2340 | return 1; | |
2341 | } | |
2342 | ||
2343 | return 0; | |
d6b0e80f AC |
2344 | } |
2345 | ||
3d799a95 DJ |
2346 | if (event == PTRACE_EVENT_EXEC) |
2347 | { | |
a75724bc PA |
2348 | if (debug_linux_nat) |
2349 | fprintf_unfiltered (gdb_stdlog, | |
2350 | "LHEW: Got exec event from LWP %ld\n", | |
2351 | GET_LWP (lp->ptid)); | |
2352 | ||
3d799a95 DJ |
2353 | ourstatus->kind = TARGET_WAITKIND_EXECD; |
2354 | ourstatus->value.execd_pathname | |
6d8fd2b7 | 2355 | = xstrdup (linux_child_pid_to_exec_file (pid)); |
3d799a95 | 2356 | |
6c95b8df PA |
2357 | return 0; |
2358 | } | |
2359 | ||
2360 | if (event == PTRACE_EVENT_VFORK_DONE) | |
2361 | { | |
2362 | if (current_inferior ()->waiting_for_vfork_done) | |
3d799a95 | 2363 | { |
6c95b8df | 2364 | if (debug_linux_nat) |
3e43a32a MS |
2365 | fprintf_unfiltered (gdb_stdlog, |
2366 | "LHEW: Got expected PTRACE_EVENT_" | |
2367 | "VFORK_DONE from LWP %ld: stopping\n", | |
6c95b8df | 2368 | GET_LWP (lp->ptid)); |
3d799a95 | 2369 | |
6c95b8df PA |
2370 | ourstatus->kind = TARGET_WAITKIND_VFORK_DONE; |
2371 | return 0; | |
3d799a95 DJ |
2372 | } |
2373 | ||
6c95b8df | 2374 | if (debug_linux_nat) |
3e43a32a MS |
2375 | fprintf_unfiltered (gdb_stdlog, |
2376 | "LHEW: Got PTRACE_EVENT_VFORK_DONE " | |
2377 | "from LWP %ld: resuming\n", | |
6c95b8df PA |
2378 | GET_LWP (lp->ptid)); |
2379 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2380 | return 1; | |
3d799a95 DJ |
2381 | } |
2382 | ||
2383 | internal_error (__FILE__, __LINE__, | |
2384 | _("unknown ptrace event %d"), event); | |
d6b0e80f AC |
2385 | } |
2386 | ||
432b4d03 JK |
2387 | /* Return non-zero if LWP is a zombie. */ |
2388 | ||
2389 | static int | |
2390 | linux_lwp_is_zombie (long lwp) | |
2391 | { | |
2392 | char buffer[MAXPATHLEN]; | |
2393 | FILE *procfile; | |
ea23808b PA |
2394 | int retval; |
2395 | int have_state; | |
432b4d03 | 2396 | |
07e78767 | 2397 | xsnprintf (buffer, sizeof (buffer), "/proc/%ld/status", lwp); |
432b4d03 JK |
2398 | procfile = fopen (buffer, "r"); |
2399 | if (procfile == NULL) | |
2400 | { | |
2401 | warning (_("unable to open /proc file '%s'"), buffer); | |
2402 | return 0; | |
2403 | } | |
ea23808b PA |
2404 | |
2405 | have_state = 0; | |
432b4d03 | 2406 | while (fgets (buffer, sizeof (buffer), procfile) != NULL) |
ea23808b | 2407 | if (strncmp (buffer, "State:", 6) == 0) |
432b4d03 | 2408 | { |
ea23808b | 2409 | have_state = 1; |
432b4d03 JK |
2410 | break; |
2411 | } | |
ea23808b PA |
2412 | retval = (have_state |
2413 | && strcmp (buffer, "State:\tZ (zombie)\n") == 0); | |
432b4d03 | 2414 | fclose (procfile); |
432b4d03 JK |
2415 | return retval; |
2416 | } | |
2417 | ||
d6b0e80f AC |
2418 | /* Wait for LP to stop. Returns the wait status, or 0 if the LWP has |
2419 | exited. */ | |
2420 | ||
2421 | static int | |
2422 | wait_lwp (struct lwp_info *lp) | |
2423 | { | |
2424 | pid_t pid; | |
432b4d03 | 2425 | int status = 0; |
d6b0e80f | 2426 | int thread_dead = 0; |
432b4d03 | 2427 | sigset_t prev_mask; |
d6b0e80f AC |
2428 | |
2429 | gdb_assert (!lp->stopped); | |
2430 | gdb_assert (lp->status == 0); | |
2431 | ||
432b4d03 JK |
2432 | /* Make sure SIGCHLD is blocked for sigsuspend avoiding a race below. */ |
2433 | block_child_signals (&prev_mask); | |
2434 | ||
2435 | for (;;) | |
d6b0e80f | 2436 | { |
432b4d03 JK |
2437 | /* If my_waitpid returns 0 it means the __WCLONE vs. non-__WCLONE kind |
2438 | was right and we should just call sigsuspend. */ | |
2439 | ||
2440 | pid = my_waitpid (GET_LWP (lp->ptid), &status, WNOHANG); | |
d6b0e80f | 2441 | if (pid == -1 && errno == ECHILD) |
432b4d03 | 2442 | pid = my_waitpid (GET_LWP (lp->ptid), &status, __WCLONE | WNOHANG); |
a9f4bb21 PA |
2443 | if (pid == -1 && errno == ECHILD) |
2444 | { | |
2445 | /* The thread has previously exited. We need to delete it | |
2446 | now because, for some vendor 2.4 kernels with NPTL | |
2447 | support backported, there won't be an exit event unless | |
2448 | it is the main thread. 2.6 kernels will report an exit | |
2449 | event for each thread that exits, as expected. */ | |
2450 | thread_dead = 1; | |
2451 | if (debug_linux_nat) | |
2452 | fprintf_unfiltered (gdb_stdlog, "WL: %s vanished.\n", | |
2453 | target_pid_to_str (lp->ptid)); | |
2454 | } | |
432b4d03 JK |
2455 | if (pid != 0) |
2456 | break; | |
2457 | ||
2458 | /* Bugs 10970, 12702. | |
2459 | Thread group leader may have exited in which case we'll lock up in | |
2460 | waitpid if there are other threads, even if they are all zombies too. | |
2461 | Basically, we're not supposed to use waitpid this way. | |
2462 | __WCLONE is not applicable for the leader so we can't use that. | |
2463 | LINUX_NAT_THREAD_ALIVE cannot be used here as it requires a STOPPED | |
2464 | process; it gets ESRCH both for the zombie and for running processes. | |
2465 | ||
2466 | As a workaround, check if we're waiting for the thread group leader and | |
2467 | if it's a zombie, and avoid calling waitpid if it is. | |
2468 | ||
2469 | This is racy, what if the tgl becomes a zombie right after we check? | |
2470 | Therefore always use WNOHANG with sigsuspend - it is equivalent to | |
2471 | waiting waitpid but the linux_lwp_is_zombie is safe this way. */ | |
2472 | ||
2473 | if (GET_PID (lp->ptid) == GET_LWP (lp->ptid) | |
2474 | && linux_lwp_is_zombie (GET_LWP (lp->ptid))) | |
d6b0e80f | 2475 | { |
d6b0e80f AC |
2476 | thread_dead = 1; |
2477 | if (debug_linux_nat) | |
432b4d03 JK |
2478 | fprintf_unfiltered (gdb_stdlog, |
2479 | "WL: Thread group leader %s vanished.\n", | |
d6b0e80f | 2480 | target_pid_to_str (lp->ptid)); |
432b4d03 | 2481 | break; |
d6b0e80f | 2482 | } |
432b4d03 JK |
2483 | |
2484 | /* Wait for next SIGCHLD and try again. This may let SIGCHLD handlers | |
2485 | get invoked despite our caller had them intentionally blocked by | |
2486 | block_child_signals. This is sensitive only to the loop of | |
2487 | linux_nat_wait_1 and there if we get called my_waitpid gets called | |
2488 | again before it gets to sigsuspend so we can safely let the handlers | |
2489 | get executed here. */ | |
2490 | ||
2491 | sigsuspend (&suspend_mask); | |
2492 | } | |
2493 | ||
2494 | restore_child_signals_mask (&prev_mask); | |
2495 | ||
d6b0e80f AC |
2496 | if (!thread_dead) |
2497 | { | |
2498 | gdb_assert (pid == GET_LWP (lp->ptid)); | |
2499 | ||
2500 | if (debug_linux_nat) | |
2501 | { | |
2502 | fprintf_unfiltered (gdb_stdlog, | |
2503 | "WL: waitpid %s received %s\n", | |
2504 | target_pid_to_str (lp->ptid), | |
2505 | status_to_str (status)); | |
2506 | } | |
d6b0e80f | 2507 | |
a9f4bb21 PA |
2508 | /* Check if the thread has exited. */ |
2509 | if (WIFEXITED (status) || WIFSIGNALED (status)) | |
2510 | { | |
2511 | thread_dead = 1; | |
2512 | if (debug_linux_nat) | |
2513 | fprintf_unfiltered (gdb_stdlog, "WL: %s exited.\n", | |
2514 | target_pid_to_str (lp->ptid)); | |
2515 | } | |
d6b0e80f AC |
2516 | } |
2517 | ||
2518 | if (thread_dead) | |
2519 | { | |
e26af52f | 2520 | exit_lwp (lp); |
d6b0e80f AC |
2521 | return 0; |
2522 | } | |
2523 | ||
2524 | gdb_assert (WIFSTOPPED (status)); | |
2525 | ||
ca2163eb PA |
2526 | /* Handle GNU/Linux's syscall SIGTRAPs. */ |
2527 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SYSCALL_SIGTRAP) | |
2528 | { | |
2529 | /* No longer need the sysgood bit. The ptrace event ends up | |
2530 | recorded in lp->waitstatus if we care for it. We can carry | |
2531 | on handling the event like a regular SIGTRAP from here | |
2532 | on. */ | |
2533 | status = W_STOPCODE (SIGTRAP); | |
2534 | if (linux_handle_syscall_trap (lp, 1)) | |
2535 | return wait_lwp (lp); | |
2536 | } | |
2537 | ||
d6b0e80f AC |
2538 | /* Handle GNU/Linux's extended waitstatus for trace events. */ |
2539 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP && status >> 16 != 0) | |
2540 | { | |
2541 | if (debug_linux_nat) | |
2542 | fprintf_unfiltered (gdb_stdlog, | |
2543 | "WL: Handling extended status 0x%06x\n", | |
2544 | status); | |
3d799a95 | 2545 | if (linux_handle_extended_wait (lp, status, 1)) |
d6b0e80f AC |
2546 | return wait_lwp (lp); |
2547 | } | |
2548 | ||
2549 | return status; | |
2550 | } | |
2551 | ||
9f0bdab8 DJ |
2552 | /* Save the most recent siginfo for LP. This is currently only called |
2553 | for SIGTRAP; some ports use the si_addr field for | |
2554 | target_stopped_data_address. In the future, it may also be used to | |
2555 | restore the siginfo of requeued signals. */ | |
2556 | ||
2557 | static void | |
2558 | save_siginfo (struct lwp_info *lp) | |
2559 | { | |
2560 | errno = 0; | |
2561 | ptrace (PTRACE_GETSIGINFO, GET_LWP (lp->ptid), | |
2562 | (PTRACE_TYPE_ARG3) 0, &lp->siginfo); | |
2563 | ||
2564 | if (errno != 0) | |
2565 | memset (&lp->siginfo, 0, sizeof (lp->siginfo)); | |
2566 | } | |
2567 | ||
d6b0e80f AC |
2568 | /* Send a SIGSTOP to LP. */ |
2569 | ||
2570 | static int | |
2571 | stop_callback (struct lwp_info *lp, void *data) | |
2572 | { | |
2573 | if (!lp->stopped && !lp->signalled) | |
2574 | { | |
2575 | int ret; | |
2576 | ||
2577 | if (debug_linux_nat) | |
2578 | { | |
2579 | fprintf_unfiltered (gdb_stdlog, | |
2580 | "SC: kill %s **<SIGSTOP>**\n", | |
2581 | target_pid_to_str (lp->ptid)); | |
2582 | } | |
2583 | errno = 0; | |
2584 | ret = kill_lwp (GET_LWP (lp->ptid), SIGSTOP); | |
2585 | if (debug_linux_nat) | |
2586 | { | |
2587 | fprintf_unfiltered (gdb_stdlog, | |
2588 | "SC: lwp kill %d %s\n", | |
2589 | ret, | |
2590 | errno ? safe_strerror (errno) : "ERRNO-OK"); | |
2591 | } | |
2592 | ||
2593 | lp->signalled = 1; | |
2594 | gdb_assert (lp->status == 0); | |
2595 | } | |
2596 | ||
2597 | return 0; | |
2598 | } | |
2599 | ||
57380f4e | 2600 | /* Return non-zero if LWP PID has a pending SIGINT. */ |
d6b0e80f AC |
2601 | |
2602 | static int | |
57380f4e DJ |
2603 | linux_nat_has_pending_sigint (int pid) |
2604 | { | |
2605 | sigset_t pending, blocked, ignored; | |
57380f4e DJ |
2606 | |
2607 | linux_proc_pending_signals (pid, &pending, &blocked, &ignored); | |
2608 | ||
2609 | if (sigismember (&pending, SIGINT) | |
2610 | && !sigismember (&ignored, SIGINT)) | |
2611 | return 1; | |
2612 | ||
2613 | return 0; | |
2614 | } | |
2615 | ||
2616 | /* Set a flag in LP indicating that we should ignore its next SIGINT. */ | |
2617 | ||
2618 | static int | |
2619 | set_ignore_sigint (struct lwp_info *lp, void *data) | |
d6b0e80f | 2620 | { |
57380f4e DJ |
2621 | /* If a thread has a pending SIGINT, consume it; otherwise, set a |
2622 | flag to consume the next one. */ | |
2623 | if (lp->stopped && lp->status != 0 && WIFSTOPPED (lp->status) | |
2624 | && WSTOPSIG (lp->status) == SIGINT) | |
2625 | lp->status = 0; | |
2626 | else | |
2627 | lp->ignore_sigint = 1; | |
2628 | ||
2629 | return 0; | |
2630 | } | |
2631 | ||
2632 | /* If LP does not have a SIGINT pending, then clear the ignore_sigint flag. | |
2633 | This function is called after we know the LWP has stopped; if the LWP | |
2634 | stopped before the expected SIGINT was delivered, then it will never have | |
2635 | arrived. Also, if the signal was delivered to a shared queue and consumed | |
2636 | by a different thread, it will never be delivered to this LWP. */ | |
d6b0e80f | 2637 | |
57380f4e DJ |
2638 | static void |
2639 | maybe_clear_ignore_sigint (struct lwp_info *lp) | |
2640 | { | |
2641 | if (!lp->ignore_sigint) | |
2642 | return; | |
2643 | ||
2644 | if (!linux_nat_has_pending_sigint (GET_LWP (lp->ptid))) | |
2645 | { | |
2646 | if (debug_linux_nat) | |
2647 | fprintf_unfiltered (gdb_stdlog, | |
2648 | "MCIS: Clearing bogus flag for %s\n", | |
2649 | target_pid_to_str (lp->ptid)); | |
2650 | lp->ignore_sigint = 0; | |
2651 | } | |
2652 | } | |
2653 | ||
ebec9a0f PA |
2654 | /* Fetch the possible triggered data watchpoint info and store it in |
2655 | LP. | |
2656 | ||
2657 | On some archs, like x86, that use debug registers to set | |
2658 | watchpoints, it's possible that the way to know which watched | |
2659 | address trapped, is to check the register that is used to select | |
2660 | which address to watch. Problem is, between setting the watchpoint | |
2661 | and reading back which data address trapped, the user may change | |
2662 | the set of watchpoints, and, as a consequence, GDB changes the | |
2663 | debug registers in the inferior. To avoid reading back a stale | |
2664 | stopped-data-address when that happens, we cache in LP the fact | |
2665 | that a watchpoint trapped, and the corresponding data address, as | |
2666 | soon as we see LP stop with a SIGTRAP. If GDB changes the debug | |
2667 | registers meanwhile, we have the cached data we can rely on. */ | |
2668 | ||
2669 | static void | |
2670 | save_sigtrap (struct lwp_info *lp) | |
2671 | { | |
2672 | struct cleanup *old_chain; | |
2673 | ||
2674 | if (linux_ops->to_stopped_by_watchpoint == NULL) | |
2675 | { | |
2676 | lp->stopped_by_watchpoint = 0; | |
2677 | return; | |
2678 | } | |
2679 | ||
2680 | old_chain = save_inferior_ptid (); | |
2681 | inferior_ptid = lp->ptid; | |
2682 | ||
2683 | lp->stopped_by_watchpoint = linux_ops->to_stopped_by_watchpoint (); | |
2684 | ||
2685 | if (lp->stopped_by_watchpoint) | |
2686 | { | |
2687 | if (linux_ops->to_stopped_data_address != NULL) | |
2688 | lp->stopped_data_address_p = | |
2689 | linux_ops->to_stopped_data_address (¤t_target, | |
2690 | &lp->stopped_data_address); | |
2691 | else | |
2692 | lp->stopped_data_address_p = 0; | |
2693 | } | |
2694 | ||
2695 | do_cleanups (old_chain); | |
2696 | } | |
2697 | ||
2698 | /* See save_sigtrap. */ | |
2699 | ||
2700 | static int | |
2701 | linux_nat_stopped_by_watchpoint (void) | |
2702 | { | |
2703 | struct lwp_info *lp = find_lwp_pid (inferior_ptid); | |
2704 | ||
2705 | gdb_assert (lp != NULL); | |
2706 | ||
2707 | return lp->stopped_by_watchpoint; | |
2708 | } | |
2709 | ||
2710 | static int | |
2711 | linux_nat_stopped_data_address (struct target_ops *ops, CORE_ADDR *addr_p) | |
2712 | { | |
2713 | struct lwp_info *lp = find_lwp_pid (inferior_ptid); | |
2714 | ||
2715 | gdb_assert (lp != NULL); | |
2716 | ||
2717 | *addr_p = lp->stopped_data_address; | |
2718 | ||
2719 | return lp->stopped_data_address_p; | |
2720 | } | |
2721 | ||
26ab7092 JK |
2722 | /* Commonly any breakpoint / watchpoint generate only SIGTRAP. */ |
2723 | ||
2724 | static int | |
2725 | sigtrap_is_event (int status) | |
2726 | { | |
2727 | return WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP; | |
2728 | } | |
2729 | ||
2730 | /* SIGTRAP-like events recognizer. */ | |
2731 | ||
2732 | static int (*linux_nat_status_is_event) (int status) = sigtrap_is_event; | |
2733 | ||
00390b84 JK |
2734 | /* Check for SIGTRAP-like events in LP. */ |
2735 | ||
2736 | static int | |
2737 | linux_nat_lp_status_is_event (struct lwp_info *lp) | |
2738 | { | |
2739 | /* We check for lp->waitstatus in addition to lp->status, because we can | |
2740 | have pending process exits recorded in lp->status | |
2741 | and W_EXITCODE(0,0) == 0. We should probably have an additional | |
2742 | lp->status_p flag. */ | |
2743 | ||
2744 | return (lp->waitstatus.kind == TARGET_WAITKIND_IGNORE | |
2745 | && linux_nat_status_is_event (lp->status)); | |
2746 | } | |
2747 | ||
26ab7092 JK |
2748 | /* Set alternative SIGTRAP-like events recognizer. If |
2749 | breakpoint_inserted_here_p there then gdbarch_decr_pc_after_break will be | |
2750 | applied. */ | |
2751 | ||
2752 | void | |
2753 | linux_nat_set_status_is_event (struct target_ops *t, | |
2754 | int (*status_is_event) (int status)) | |
2755 | { | |
2756 | linux_nat_status_is_event = status_is_event; | |
2757 | } | |
2758 | ||
57380f4e DJ |
2759 | /* Wait until LP is stopped. */ |
2760 | ||
2761 | static int | |
2762 | stop_wait_callback (struct lwp_info *lp, void *data) | |
2763 | { | |
6c95b8df PA |
2764 | struct inferior *inf = find_inferior_pid (GET_PID (lp->ptid)); |
2765 | ||
2766 | /* If this is a vfork parent, bail out, it is not going to report | |
2767 | any SIGSTOP until the vfork is done with. */ | |
2768 | if (inf->vfork_child != NULL) | |
2769 | return 0; | |
2770 | ||
d6b0e80f AC |
2771 | if (!lp->stopped) |
2772 | { | |
2773 | int status; | |
2774 | ||
2775 | status = wait_lwp (lp); | |
2776 | if (status == 0) | |
2777 | return 0; | |
2778 | ||
57380f4e DJ |
2779 | if (lp->ignore_sigint && WIFSTOPPED (status) |
2780 | && WSTOPSIG (status) == SIGINT) | |
d6b0e80f | 2781 | { |
57380f4e | 2782 | lp->ignore_sigint = 0; |
d6b0e80f AC |
2783 | |
2784 | errno = 0; | |
2785 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2786 | if (debug_linux_nat) | |
2787 | fprintf_unfiltered (gdb_stdlog, | |
3e43a32a MS |
2788 | "PTRACE_CONT %s, 0, 0 (%s) " |
2789 | "(discarding SIGINT)\n", | |
d6b0e80f AC |
2790 | target_pid_to_str (lp->ptid), |
2791 | errno ? safe_strerror (errno) : "OK"); | |
2792 | ||
57380f4e | 2793 | return stop_wait_callback (lp, NULL); |
d6b0e80f AC |
2794 | } |
2795 | ||
57380f4e DJ |
2796 | maybe_clear_ignore_sigint (lp); |
2797 | ||
d6b0e80f AC |
2798 | if (WSTOPSIG (status) != SIGSTOP) |
2799 | { | |
26ab7092 | 2800 | if (linux_nat_status_is_event (status)) |
d6b0e80f AC |
2801 | { |
2802 | /* If a LWP other than the LWP that we're reporting an | |
2803 | event for has hit a GDB breakpoint (as opposed to | |
2804 | some random trap signal), then just arrange for it to | |
2805 | hit it again later. We don't keep the SIGTRAP status | |
2806 | and don't forward the SIGTRAP signal to the LWP. We | |
2807 | will handle the current event, eventually we will | |
2808 | resume all LWPs, and this one will get its breakpoint | |
2809 | trap again. | |
2810 | ||
2811 | If we do not do this, then we run the risk that the | |
2812 | user will delete or disable the breakpoint, but the | |
2813 | thread will have already tripped on it. */ | |
2814 | ||
9f0bdab8 DJ |
2815 | /* Save the trap's siginfo in case we need it later. */ |
2816 | save_siginfo (lp); | |
2817 | ||
ebec9a0f PA |
2818 | save_sigtrap (lp); |
2819 | ||
1777feb0 | 2820 | /* Now resume this LWP and get the SIGSTOP event. */ |
d6b0e80f AC |
2821 | errno = 0; |
2822 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2823 | if (debug_linux_nat) | |
2824 | { | |
2825 | fprintf_unfiltered (gdb_stdlog, | |
2826 | "PTRACE_CONT %s, 0, 0 (%s)\n", | |
2827 | target_pid_to_str (lp->ptid), | |
2828 | errno ? safe_strerror (errno) : "OK"); | |
2829 | ||
2830 | fprintf_unfiltered (gdb_stdlog, | |
2831 | "SWC: Candidate SIGTRAP event in %s\n", | |
2832 | target_pid_to_str (lp->ptid)); | |
2833 | } | |
710151dd | 2834 | /* Hold this event/waitstatus while we check to see if |
1777feb0 | 2835 | there are any more (we still want to get that SIGSTOP). */ |
57380f4e | 2836 | stop_wait_callback (lp, NULL); |
710151dd | 2837 | |
7feb7d06 PA |
2838 | /* Hold the SIGTRAP for handling by linux_nat_wait. If |
2839 | there's another event, throw it back into the | |
1777feb0 | 2840 | queue. */ |
7feb7d06 | 2841 | if (lp->status) |
710151dd | 2842 | { |
7feb7d06 PA |
2843 | if (debug_linux_nat) |
2844 | fprintf_unfiltered (gdb_stdlog, | |
2845 | "SWC: kill %s, %s\n", | |
2846 | target_pid_to_str (lp->ptid), | |
2847 | status_to_str ((int) status)); | |
2848 | kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (lp->status)); | |
d6b0e80f | 2849 | } |
7feb7d06 | 2850 | |
1777feb0 | 2851 | /* Save the sigtrap event. */ |
7feb7d06 | 2852 | lp->status = status; |
d6b0e80f AC |
2853 | return 0; |
2854 | } | |
2855 | else | |
2856 | { | |
2857 | /* The thread was stopped with a signal other than | |
1777feb0 | 2858 | SIGSTOP, and didn't accidentally trip a breakpoint. */ |
d6b0e80f AC |
2859 | |
2860 | if (debug_linux_nat) | |
2861 | { | |
2862 | fprintf_unfiltered (gdb_stdlog, | |
2863 | "SWC: Pending event %s in %s\n", | |
2864 | status_to_str ((int) status), | |
2865 | target_pid_to_str (lp->ptid)); | |
2866 | } | |
1777feb0 | 2867 | /* Now resume this LWP and get the SIGSTOP event. */ |
d6b0e80f AC |
2868 | errno = 0; |
2869 | ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0); | |
2870 | if (debug_linux_nat) | |
2871 | fprintf_unfiltered (gdb_stdlog, | |
2872 | "SWC: PTRACE_CONT %s, 0, 0 (%s)\n", | |
2873 | target_pid_to_str (lp->ptid), | |
2874 | errno ? safe_strerror (errno) : "OK"); | |
2875 | ||
2876 | /* Hold this event/waitstatus while we check to see if | |
1777feb0 | 2877 | there are any more (we still want to get that SIGSTOP). */ |
57380f4e | 2878 | stop_wait_callback (lp, NULL); |
710151dd PA |
2879 | |
2880 | /* If the lp->status field is still empty, use it to | |
2881 | hold this event. If not, then this event must be | |
2882 | returned to the event queue of the LWP. */ | |
7feb7d06 | 2883 | if (lp->status) |
d6b0e80f AC |
2884 | { |
2885 | if (debug_linux_nat) | |
2886 | { | |
2887 | fprintf_unfiltered (gdb_stdlog, | |
2888 | "SWC: kill %s, %s\n", | |
2889 | target_pid_to_str (lp->ptid), | |
2890 | status_to_str ((int) status)); | |
2891 | } | |
2892 | kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (status)); | |
2893 | } | |
710151dd PA |
2894 | else |
2895 | lp->status = status; | |
d6b0e80f AC |
2896 | return 0; |
2897 | } | |
2898 | } | |
2899 | else | |
2900 | { | |
2901 | /* We caught the SIGSTOP that we intended to catch, so | |
2902 | there's no SIGSTOP pending. */ | |
2903 | lp->stopped = 1; | |
2904 | lp->signalled = 0; | |
2905 | } | |
2906 | } | |
2907 | ||
2908 | return 0; | |
2909 | } | |
2910 | ||
d6b0e80f AC |
2911 | /* Return non-zero if LP has a wait status pending. */ |
2912 | ||
2913 | static int | |
2914 | status_callback (struct lwp_info *lp, void *data) | |
2915 | { | |
2916 | /* Only report a pending wait status if we pretend that this has | |
2917 | indeed been resumed. */ | |
ca2163eb PA |
2918 | if (!lp->resumed) |
2919 | return 0; | |
2920 | ||
2921 | if (lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) | |
2922 | { | |
2923 | /* A ptrace event, like PTRACE_FORK|VFORK|EXEC, syscall event, | |
766062f6 | 2924 | or a pending process exit. Note that `W_EXITCODE(0,0) == |
ca2163eb PA |
2925 | 0', so a clean process exit can not be stored pending in |
2926 | lp->status, it is indistinguishable from | |
2927 | no-pending-status. */ | |
2928 | return 1; | |
2929 | } | |
2930 | ||
2931 | if (lp->status != 0) | |
2932 | return 1; | |
2933 | ||
2934 | return 0; | |
d6b0e80f AC |
2935 | } |
2936 | ||
2937 | /* Return non-zero if LP isn't stopped. */ | |
2938 | ||
2939 | static int | |
2940 | running_callback (struct lwp_info *lp, void *data) | |
2941 | { | |
25289eb2 PA |
2942 | return (!lp->stopped |
2943 | || ((lp->status != 0 | |
2944 | || lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) | |
2945 | && lp->resumed)); | |
d6b0e80f AC |
2946 | } |
2947 | ||
2948 | /* Count the LWP's that have had events. */ | |
2949 | ||
2950 | static int | |
2951 | count_events_callback (struct lwp_info *lp, void *data) | |
2952 | { | |
2953 | int *count = data; | |
2954 | ||
2955 | gdb_assert (count != NULL); | |
2956 | ||
e09490f1 | 2957 | /* Count only resumed LWPs that have a SIGTRAP event pending. */ |
00390b84 | 2958 | if (lp->resumed && linux_nat_lp_status_is_event (lp)) |
d6b0e80f AC |
2959 | (*count)++; |
2960 | ||
2961 | return 0; | |
2962 | } | |
2963 | ||
2964 | /* Select the LWP (if any) that is currently being single-stepped. */ | |
2965 | ||
2966 | static int | |
2967 | select_singlestep_lwp_callback (struct lwp_info *lp, void *data) | |
2968 | { | |
25289eb2 PA |
2969 | if (lp->last_resume_kind == resume_step |
2970 | && lp->status != 0) | |
d6b0e80f AC |
2971 | return 1; |
2972 | else | |
2973 | return 0; | |
2974 | } | |
2975 | ||
2976 | /* Select the Nth LWP that has had a SIGTRAP event. */ | |
2977 | ||
2978 | static int | |
2979 | select_event_lwp_callback (struct lwp_info *lp, void *data) | |
2980 | { | |
2981 | int *selector = data; | |
2982 | ||
2983 | gdb_assert (selector != NULL); | |
2984 | ||
1777feb0 | 2985 | /* Select only resumed LWPs that have a SIGTRAP event pending. */ |
00390b84 | 2986 | if (lp->resumed && linux_nat_lp_status_is_event (lp)) |
d6b0e80f AC |
2987 | if ((*selector)-- == 0) |
2988 | return 1; | |
2989 | ||
2990 | return 0; | |
2991 | } | |
2992 | ||
710151dd PA |
2993 | static int |
2994 | cancel_breakpoint (struct lwp_info *lp) | |
2995 | { | |
2996 | /* Arrange for a breakpoint to be hit again later. We don't keep | |
2997 | the SIGTRAP status and don't forward the SIGTRAP signal to the | |
2998 | LWP. We will handle the current event, eventually we will resume | |
2999 | this LWP, and this breakpoint will trap again. | |
3000 | ||
3001 | If we do not do this, then we run the risk that the user will | |
3002 | delete or disable the breakpoint, but the LWP will have already | |
3003 | tripped on it. */ | |
3004 | ||
515630c5 UW |
3005 | struct regcache *regcache = get_thread_regcache (lp->ptid); |
3006 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
3007 | CORE_ADDR pc; | |
3008 | ||
3009 | pc = regcache_read_pc (regcache) - gdbarch_decr_pc_after_break (gdbarch); | |
6c95b8df | 3010 | if (breakpoint_inserted_here_p (get_regcache_aspace (regcache), pc)) |
710151dd PA |
3011 | { |
3012 | if (debug_linux_nat) | |
3013 | fprintf_unfiltered (gdb_stdlog, | |
3014 | "CB: Push back breakpoint for %s\n", | |
3015 | target_pid_to_str (lp->ptid)); | |
3016 | ||
3017 | /* Back up the PC if necessary. */ | |
515630c5 UW |
3018 | if (gdbarch_decr_pc_after_break (gdbarch)) |
3019 | regcache_write_pc (regcache, pc); | |
3020 | ||
710151dd PA |
3021 | return 1; |
3022 | } | |
3023 | return 0; | |
3024 | } | |
3025 | ||
d6b0e80f AC |
3026 | static int |
3027 | cancel_breakpoints_callback (struct lwp_info *lp, void *data) | |
3028 | { | |
3029 | struct lwp_info *event_lp = data; | |
3030 | ||
3031 | /* Leave the LWP that has been elected to receive a SIGTRAP alone. */ | |
3032 | if (lp == event_lp) | |
3033 | return 0; | |
3034 | ||
3035 | /* If a LWP other than the LWP that we're reporting an event for has | |
3036 | hit a GDB breakpoint (as opposed to some random trap signal), | |
3037 | then just arrange for it to hit it again later. We don't keep | |
3038 | the SIGTRAP status and don't forward the SIGTRAP signal to the | |
3039 | LWP. We will handle the current event, eventually we will resume | |
3040 | all LWPs, and this one will get its breakpoint trap again. | |
3041 | ||
3042 | If we do not do this, then we run the risk that the user will | |
3043 | delete or disable the breakpoint, but the LWP will have already | |
3044 | tripped on it. */ | |
3045 | ||
00390b84 | 3046 | if (linux_nat_lp_status_is_event (lp) |
710151dd PA |
3047 | && cancel_breakpoint (lp)) |
3048 | /* Throw away the SIGTRAP. */ | |
3049 | lp->status = 0; | |
d6b0e80f AC |
3050 | |
3051 | return 0; | |
3052 | } | |
3053 | ||
3054 | /* Select one LWP out of those that have events pending. */ | |
3055 | ||
3056 | static void | |
d90e17a7 | 3057 | select_event_lwp (ptid_t filter, struct lwp_info **orig_lp, int *status) |
d6b0e80f AC |
3058 | { |
3059 | int num_events = 0; | |
3060 | int random_selector; | |
3061 | struct lwp_info *event_lp; | |
3062 | ||
ac264b3b | 3063 | /* Record the wait status for the original LWP. */ |
d6b0e80f AC |
3064 | (*orig_lp)->status = *status; |
3065 | ||
3066 | /* Give preference to any LWP that is being single-stepped. */ | |
d90e17a7 PA |
3067 | event_lp = iterate_over_lwps (filter, |
3068 | select_singlestep_lwp_callback, NULL); | |
d6b0e80f AC |
3069 | if (event_lp != NULL) |
3070 | { | |
3071 | if (debug_linux_nat) | |
3072 | fprintf_unfiltered (gdb_stdlog, | |
3073 | "SEL: Select single-step %s\n", | |
3074 | target_pid_to_str (event_lp->ptid)); | |
3075 | } | |
3076 | else | |
3077 | { | |
3078 | /* No single-stepping LWP. Select one at random, out of those | |
3079 | which have had SIGTRAP events. */ | |
3080 | ||
3081 | /* First see how many SIGTRAP events we have. */ | |
d90e17a7 | 3082 | iterate_over_lwps (filter, count_events_callback, &num_events); |
d6b0e80f AC |
3083 | |
3084 | /* Now randomly pick a LWP out of those that have had a SIGTRAP. */ | |
3085 | random_selector = (int) | |
3086 | ((num_events * (double) rand ()) / (RAND_MAX + 1.0)); | |
3087 | ||
3088 | if (debug_linux_nat && num_events > 1) | |
3089 | fprintf_unfiltered (gdb_stdlog, | |
3090 | "SEL: Found %d SIGTRAP events, selecting #%d\n", | |
3091 | num_events, random_selector); | |
3092 | ||
d90e17a7 PA |
3093 | event_lp = iterate_over_lwps (filter, |
3094 | select_event_lwp_callback, | |
d6b0e80f AC |
3095 | &random_selector); |
3096 | } | |
3097 | ||
3098 | if (event_lp != NULL) | |
3099 | { | |
3100 | /* Switch the event LWP. */ | |
3101 | *orig_lp = event_lp; | |
3102 | *status = event_lp->status; | |
3103 | } | |
3104 | ||
3105 | /* Flush the wait status for the event LWP. */ | |
3106 | (*orig_lp)->status = 0; | |
3107 | } | |
3108 | ||
3109 | /* Return non-zero if LP has been resumed. */ | |
3110 | ||
3111 | static int | |
3112 | resumed_callback (struct lwp_info *lp, void *data) | |
3113 | { | |
3114 | return lp->resumed; | |
3115 | } | |
3116 | ||
12d9289a PA |
3117 | /* Stop an active thread, verify it still exists, then resume it. If |
3118 | the thread ends up with a pending status, then it is not resumed, | |
3119 | and *DATA (really a pointer to int), is set. */ | |
d6b0e80f AC |
3120 | |
3121 | static int | |
3122 | stop_and_resume_callback (struct lwp_info *lp, void *data) | |
3123 | { | |
12d9289a PA |
3124 | int *new_pending_p = data; |
3125 | ||
25289eb2 | 3126 | if (!lp->stopped) |
d6b0e80f | 3127 | { |
25289eb2 PA |
3128 | ptid_t ptid = lp->ptid; |
3129 | ||
d6b0e80f AC |
3130 | stop_callback (lp, NULL); |
3131 | stop_wait_callback (lp, NULL); | |
25289eb2 PA |
3132 | |
3133 | /* Resume if the lwp still exists, and the core wanted it | |
3134 | running. */ | |
12d9289a PA |
3135 | lp = find_lwp_pid (ptid); |
3136 | if (lp != NULL) | |
25289eb2 | 3137 | { |
12d9289a PA |
3138 | if (lp->last_resume_kind == resume_stop |
3139 | && lp->status == 0) | |
3140 | { | |
3141 | /* The core wanted the LWP to stop. Even if it stopped | |
3142 | cleanly (with SIGSTOP), leave the event pending. */ | |
3143 | if (debug_linux_nat) | |
3144 | fprintf_unfiltered (gdb_stdlog, | |
3145 | "SARC: core wanted LWP %ld stopped " | |
3146 | "(leaving SIGSTOP pending)\n", | |
3147 | GET_LWP (lp->ptid)); | |
3148 | lp->status = W_STOPCODE (SIGSTOP); | |
3149 | } | |
3150 | ||
3151 | if (lp->status == 0) | |
3152 | { | |
3153 | if (debug_linux_nat) | |
3154 | fprintf_unfiltered (gdb_stdlog, | |
3155 | "SARC: re-resuming LWP %ld\n", | |
3156 | GET_LWP (lp->ptid)); | |
3157 | resume_lwp (lp, lp->step); | |
3158 | } | |
3159 | else | |
3160 | { | |
3161 | if (debug_linux_nat) | |
3162 | fprintf_unfiltered (gdb_stdlog, | |
3163 | "SARC: not re-resuming LWP %ld " | |
3164 | "(has pending)\n", | |
3165 | GET_LWP (lp->ptid)); | |
3166 | if (new_pending_p) | |
3167 | *new_pending_p = 1; | |
3168 | } | |
25289eb2 | 3169 | } |
d6b0e80f AC |
3170 | } |
3171 | return 0; | |
3172 | } | |
3173 | ||
02f3fc28 | 3174 | /* Check if we should go on and pass this event to common code. |
12d9289a PA |
3175 | Return the affected lwp if we are, or NULL otherwise. If we stop |
3176 | all lwps temporarily, we may end up with new pending events in some | |
3177 | other lwp. In that case set *NEW_PENDING_P to true. */ | |
3178 | ||
02f3fc28 | 3179 | static struct lwp_info * |
0e5bf2a8 | 3180 | linux_nat_filter_event (int lwpid, int status, int *new_pending_p) |
02f3fc28 PA |
3181 | { |
3182 | struct lwp_info *lp; | |
3183 | ||
12d9289a PA |
3184 | *new_pending_p = 0; |
3185 | ||
02f3fc28 PA |
3186 | lp = find_lwp_pid (pid_to_ptid (lwpid)); |
3187 | ||
3188 | /* Check for stop events reported by a process we didn't already | |
3189 | know about - anything not already in our LWP list. | |
3190 | ||
3191 | If we're expecting to receive stopped processes after | |
3192 | fork, vfork, and clone events, then we'll just add the | |
3193 | new one to our list and go back to waiting for the event | |
3194 | to be reported - the stopped process might be returned | |
0e5bf2a8 PA |
3195 | from waitpid before or after the event is. |
3196 | ||
3197 | But note the case of a non-leader thread exec'ing after the | |
3198 | leader having exited, and gone from our lists. The non-leader | |
3199 | thread changes its tid to the tgid. */ | |
3200 | ||
3201 | if (WIFSTOPPED (status) && lp == NULL | |
3202 | && (WSTOPSIG (status) == SIGTRAP && status >> 16 == PTRACE_EVENT_EXEC)) | |
3203 | { | |
3204 | /* A multi-thread exec after we had seen the leader exiting. */ | |
3205 | if (debug_linux_nat) | |
3206 | fprintf_unfiltered (gdb_stdlog, | |
3207 | "LLW: Re-adding thread group leader LWP %d.\n", | |
3208 | lwpid); | |
3209 | ||
3210 | lp = add_lwp (BUILD_LWP (lwpid, lwpid)); | |
3211 | lp->stopped = 1; | |
3212 | lp->resumed = 1; | |
3213 | add_thread (lp->ptid); | |
3214 | } | |
3215 | ||
02f3fc28 PA |
3216 | if (WIFSTOPPED (status) && !lp) |
3217 | { | |
84636d28 | 3218 | add_to_pid_list (&stopped_pids, lwpid, status); |
02f3fc28 PA |
3219 | return NULL; |
3220 | } | |
3221 | ||
3222 | /* Make sure we don't report an event for the exit of an LWP not in | |
1777feb0 | 3223 | our list, i.e. not part of the current process. This can happen |
fd62cb89 | 3224 | if we detach from a program we originally forked and then it |
02f3fc28 PA |
3225 | exits. */ |
3226 | if (!WIFSTOPPED (status) && !lp) | |
3227 | return NULL; | |
3228 | ||
ca2163eb PA |
3229 | /* Handle GNU/Linux's syscall SIGTRAPs. */ |
3230 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SYSCALL_SIGTRAP) | |
3231 | { | |
3232 | /* No longer need the sysgood bit. The ptrace event ends up | |
3233 | recorded in lp->waitstatus if we care for it. We can carry | |
3234 | on handling the event like a regular SIGTRAP from here | |
3235 | on. */ | |
3236 | status = W_STOPCODE (SIGTRAP); | |
3237 | if (linux_handle_syscall_trap (lp, 0)) | |
3238 | return NULL; | |
3239 | } | |
02f3fc28 | 3240 | |
ca2163eb PA |
3241 | /* Handle GNU/Linux's extended waitstatus for trace events. */ |
3242 | if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP && status >> 16 != 0) | |
02f3fc28 PA |
3243 | { |
3244 | if (debug_linux_nat) | |
3245 | fprintf_unfiltered (gdb_stdlog, | |
3246 | "LLW: Handling extended status 0x%06x\n", | |
3247 | status); | |
3248 | if (linux_handle_extended_wait (lp, status, 0)) | |
3249 | return NULL; | |
3250 | } | |
3251 | ||
26ab7092 | 3252 | if (linux_nat_status_is_event (status)) |
ebec9a0f PA |
3253 | { |
3254 | /* Save the trap's siginfo in case we need it later. */ | |
3255 | save_siginfo (lp); | |
3256 | ||
3257 | save_sigtrap (lp); | |
3258 | } | |
ca2163eb | 3259 | |
02f3fc28 | 3260 | /* Check if the thread has exited. */ |
d90e17a7 PA |
3261 | if ((WIFEXITED (status) || WIFSIGNALED (status)) |
3262 | && num_lwps (GET_PID (lp->ptid)) > 1) | |
02f3fc28 | 3263 | { |
9db03742 JB |
3264 | /* If this is the main thread, we must stop all threads and verify |
3265 | if they are still alive. This is because in the nptl thread model | |
3266 | on Linux 2.4, there is no signal issued for exiting LWPs | |
02f3fc28 PA |
3267 | other than the main thread. We only get the main thread exit |
3268 | signal once all child threads have already exited. If we | |
3269 | stop all the threads and use the stop_wait_callback to check | |
3270 | if they have exited we can determine whether this signal | |
3271 | should be ignored or whether it means the end of the debugged | |
3272 | application, regardless of which threading model is being | |
5d3b6af6 | 3273 | used. */ |
02f3fc28 PA |
3274 | if (GET_PID (lp->ptid) == GET_LWP (lp->ptid)) |
3275 | { | |
3276 | lp->stopped = 1; | |
d90e17a7 | 3277 | iterate_over_lwps (pid_to_ptid (GET_PID (lp->ptid)), |
12d9289a | 3278 | stop_and_resume_callback, new_pending_p); |
02f3fc28 PA |
3279 | } |
3280 | ||
3281 | if (debug_linux_nat) | |
3282 | fprintf_unfiltered (gdb_stdlog, | |
3283 | "LLW: %s exited.\n", | |
3284 | target_pid_to_str (lp->ptid)); | |
3285 | ||
d90e17a7 | 3286 | if (num_lwps (GET_PID (lp->ptid)) > 1) |
9db03742 JB |
3287 | { |
3288 | /* If there is at least one more LWP, then the exit signal | |
3289 | was not the end of the debugged application and should be | |
3290 | ignored. */ | |
3291 | exit_lwp (lp); | |
3292 | return NULL; | |
3293 | } | |
02f3fc28 PA |
3294 | } |
3295 | ||
3296 | /* Check if the current LWP has previously exited. In the nptl | |
3297 | thread model, LWPs other than the main thread do not issue | |
3298 | signals when they exit so we must check whenever the thread has | |
3299 | stopped. A similar check is made in stop_wait_callback(). */ | |
d90e17a7 | 3300 | if (num_lwps (GET_PID (lp->ptid)) > 1 && !linux_thread_alive (lp->ptid)) |
02f3fc28 | 3301 | { |
d90e17a7 PA |
3302 | ptid_t ptid = pid_to_ptid (GET_PID (lp->ptid)); |
3303 | ||
02f3fc28 PA |
3304 | if (debug_linux_nat) |
3305 | fprintf_unfiltered (gdb_stdlog, | |
3306 | "LLW: %s exited.\n", | |
3307 | target_pid_to_str (lp->ptid)); | |
3308 | ||
3309 | exit_lwp (lp); | |
3310 | ||
3311 | /* Make sure there is at least one thread running. */ | |
d90e17a7 | 3312 | gdb_assert (iterate_over_lwps (ptid, running_callback, NULL)); |
02f3fc28 PA |
3313 | |
3314 | /* Discard the event. */ | |
3315 | return NULL; | |
3316 | } | |
3317 | ||
3318 | /* Make sure we don't report a SIGSTOP that we sent ourselves in | |
3319 | an attempt to stop an LWP. */ | |
3320 | if (lp->signalled | |
3321 | && WIFSTOPPED (status) && WSTOPSIG (status) == SIGSTOP) | |
3322 | { | |
3323 | if (debug_linux_nat) | |
3324 | fprintf_unfiltered (gdb_stdlog, | |
3325 | "LLW: Delayed SIGSTOP caught for %s.\n", | |
3326 | target_pid_to_str (lp->ptid)); | |
3327 | ||
02f3fc28 PA |
3328 | lp->signalled = 0; |
3329 | ||
25289eb2 PA |
3330 | if (lp->last_resume_kind != resume_stop) |
3331 | { | |
3332 | /* This is a delayed SIGSTOP. */ | |
02f3fc28 | 3333 | |
25289eb2 PA |
3334 | registers_changed (); |
3335 | ||
3336 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), | |
02f3fc28 | 3337 | lp->step, TARGET_SIGNAL_0); |
25289eb2 PA |
3338 | if (debug_linux_nat) |
3339 | fprintf_unfiltered (gdb_stdlog, | |
3340 | "LLW: %s %s, 0, 0 (discard SIGSTOP)\n", | |
3341 | lp->step ? | |
3342 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
3343 | target_pid_to_str (lp->ptid)); | |
02f3fc28 | 3344 | |
25289eb2 PA |
3345 | lp->stopped = 0; |
3346 | gdb_assert (lp->resumed); | |
02f3fc28 | 3347 | |
25289eb2 PA |
3348 | /* Discard the event. */ |
3349 | return NULL; | |
3350 | } | |
02f3fc28 PA |
3351 | } |
3352 | ||
57380f4e DJ |
3353 | /* Make sure we don't report a SIGINT that we have already displayed |
3354 | for another thread. */ | |
3355 | if (lp->ignore_sigint | |
3356 | && WIFSTOPPED (status) && WSTOPSIG (status) == SIGINT) | |
3357 | { | |
3358 | if (debug_linux_nat) | |
3359 | fprintf_unfiltered (gdb_stdlog, | |
3360 | "LLW: Delayed SIGINT caught for %s.\n", | |
3361 | target_pid_to_str (lp->ptid)); | |
3362 | ||
3363 | /* This is a delayed SIGINT. */ | |
3364 | lp->ignore_sigint = 0; | |
3365 | ||
3366 | registers_changed (); | |
28439f5e | 3367 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
57380f4e DJ |
3368 | lp->step, TARGET_SIGNAL_0); |
3369 | if (debug_linux_nat) | |
3370 | fprintf_unfiltered (gdb_stdlog, | |
3371 | "LLW: %s %s, 0, 0 (discard SIGINT)\n", | |
3372 | lp->step ? | |
3373 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
3374 | target_pid_to_str (lp->ptid)); | |
3375 | ||
3376 | lp->stopped = 0; | |
3377 | gdb_assert (lp->resumed); | |
3378 | ||
3379 | /* Discard the event. */ | |
3380 | return NULL; | |
3381 | } | |
3382 | ||
02f3fc28 PA |
3383 | /* An interesting event. */ |
3384 | gdb_assert (lp); | |
ca2163eb | 3385 | lp->status = status; |
02f3fc28 PA |
3386 | return lp; |
3387 | } | |
3388 | ||
0e5bf2a8 PA |
3389 | /* Detect zombie thread group leaders, and "exit" them. We can't reap |
3390 | their exits until all other threads in the group have exited. */ | |
3391 | ||
3392 | static void | |
3393 | check_zombie_leaders (void) | |
3394 | { | |
3395 | struct inferior *inf; | |
3396 | ||
3397 | ALL_INFERIORS (inf) | |
3398 | { | |
3399 | struct lwp_info *leader_lp; | |
3400 | ||
3401 | if (inf->pid == 0) | |
3402 | continue; | |
3403 | ||
3404 | leader_lp = find_lwp_pid (pid_to_ptid (inf->pid)); | |
3405 | if (leader_lp != NULL | |
3406 | /* Check if there are other threads in the group, as we may | |
3407 | have raced with the inferior simply exiting. */ | |
3408 | && num_lwps (inf->pid) > 1 | |
3409 | && linux_lwp_is_zombie (inf->pid)) | |
3410 | { | |
3411 | if (debug_linux_nat) | |
3412 | fprintf_unfiltered (gdb_stdlog, | |
3413 | "CZL: Thread group leader %d zombie " | |
3414 | "(it exited, or another thread execd).\n", | |
3415 | inf->pid); | |
3416 | ||
3417 | /* A leader zombie can mean one of two things: | |
3418 | ||
3419 | - It exited, and there's an exit status pending | |
3420 | available, or only the leader exited (not the whole | |
3421 | program). In the latter case, we can't waitpid the | |
3422 | leader's exit status until all other threads are gone. | |
3423 | ||
3424 | - There are 3 or more threads in the group, and a thread | |
3425 | other than the leader exec'd. On an exec, the Linux | |
3426 | kernel destroys all other threads (except the execing | |
3427 | one) in the thread group, and resets the execing thread's | |
3428 | tid to the tgid. No exit notification is sent for the | |
3429 | execing thread -- from the ptracer's perspective, it | |
3430 | appears as though the execing thread just vanishes. | |
3431 | Until we reap all other threads except the leader and the | |
3432 | execing thread, the leader will be zombie, and the | |
3433 | execing thread will be in `D (disc sleep)'. As soon as | |
3434 | all other threads are reaped, the execing thread changes | |
3435 | it's tid to the tgid, and the previous (zombie) leader | |
3436 | vanishes, giving place to the "new" leader. We could try | |
3437 | distinguishing the exit and exec cases, by waiting once | |
3438 | more, and seeing if something comes out, but it doesn't | |
3439 | sound useful. The previous leader _does_ go away, and | |
3440 | we'll re-add the new one once we see the exec event | |
3441 | (which is just the same as what would happen if the | |
3442 | previous leader did exit voluntarily before some other | |
3443 | thread execs). */ | |
3444 | ||
3445 | if (debug_linux_nat) | |
3446 | fprintf_unfiltered (gdb_stdlog, | |
3447 | "CZL: Thread group leader %d vanished.\n", | |
3448 | inf->pid); | |
3449 | exit_lwp (leader_lp); | |
3450 | } | |
3451 | } | |
3452 | } | |
3453 | ||
d6b0e80f | 3454 | static ptid_t |
7feb7d06 | 3455 | linux_nat_wait_1 (struct target_ops *ops, |
47608cb1 PA |
3456 | ptid_t ptid, struct target_waitstatus *ourstatus, |
3457 | int target_options) | |
d6b0e80f | 3458 | { |
7feb7d06 | 3459 | static sigset_t prev_mask; |
4b60df3d | 3460 | enum resume_kind last_resume_kind; |
12d9289a | 3461 | struct lwp_info *lp; |
12d9289a | 3462 | int status; |
d6b0e80f | 3463 | |
01124a23 | 3464 | if (debug_linux_nat) |
b84876c2 PA |
3465 | fprintf_unfiltered (gdb_stdlog, "LLW: enter\n"); |
3466 | ||
f973ed9c DJ |
3467 | /* The first time we get here after starting a new inferior, we may |
3468 | not have added it to the LWP list yet - this is the earliest | |
3469 | moment at which we know its PID. */ | |
d90e17a7 | 3470 | if (ptid_is_pid (inferior_ptid)) |
f973ed9c | 3471 | { |
27c9d204 PA |
3472 | /* Upgrade the main thread's ptid. */ |
3473 | thread_change_ptid (inferior_ptid, | |
3474 | BUILD_LWP (GET_PID (inferior_ptid), | |
3475 | GET_PID (inferior_ptid))); | |
3476 | ||
f973ed9c DJ |
3477 | lp = add_lwp (inferior_ptid); |
3478 | lp->resumed = 1; | |
3479 | } | |
3480 | ||
7feb7d06 PA |
3481 | /* Make sure SIGCHLD is blocked. */ |
3482 | block_child_signals (&prev_mask); | |
d6b0e80f AC |
3483 | |
3484 | retry: | |
d90e17a7 PA |
3485 | lp = NULL; |
3486 | status = 0; | |
d6b0e80f AC |
3487 | |
3488 | /* First check if there is a LWP with a wait status pending. */ | |
0e5bf2a8 | 3489 | if (ptid_equal (ptid, minus_one_ptid) || ptid_is_pid (ptid)) |
d6b0e80f | 3490 | { |
0e5bf2a8 | 3491 | /* Any LWP in the PTID group that's been resumed will do. */ |
d90e17a7 | 3492 | lp = iterate_over_lwps (ptid, status_callback, NULL); |
d6b0e80f AC |
3493 | if (lp) |
3494 | { | |
ca2163eb | 3495 | if (debug_linux_nat && lp->status) |
d6b0e80f AC |
3496 | fprintf_unfiltered (gdb_stdlog, |
3497 | "LLW: Using pending wait status %s for %s.\n", | |
ca2163eb | 3498 | status_to_str (lp->status), |
d6b0e80f AC |
3499 | target_pid_to_str (lp->ptid)); |
3500 | } | |
d6b0e80f AC |
3501 | } |
3502 | else if (is_lwp (ptid)) | |
3503 | { | |
3504 | if (debug_linux_nat) | |
3505 | fprintf_unfiltered (gdb_stdlog, | |
3506 | "LLW: Waiting for specific LWP %s.\n", | |
3507 | target_pid_to_str (ptid)); | |
3508 | ||
3509 | /* We have a specific LWP to check. */ | |
3510 | lp = find_lwp_pid (ptid); | |
3511 | gdb_assert (lp); | |
d6b0e80f | 3512 | |
ca2163eb | 3513 | if (debug_linux_nat && lp->status) |
d6b0e80f AC |
3514 | fprintf_unfiltered (gdb_stdlog, |
3515 | "LLW: Using pending wait status %s for %s.\n", | |
ca2163eb | 3516 | status_to_str (lp->status), |
d6b0e80f AC |
3517 | target_pid_to_str (lp->ptid)); |
3518 | ||
d90e17a7 PA |
3519 | /* We check for lp->waitstatus in addition to lp->status, |
3520 | because we can have pending process exits recorded in | |
3521 | lp->status and W_EXITCODE(0,0) == 0. We should probably have | |
3522 | an additional lp->status_p flag. */ | |
ca2163eb | 3523 | if (lp->status == 0 && lp->waitstatus.kind == TARGET_WAITKIND_IGNORE) |
d90e17a7 | 3524 | lp = NULL; |
d6b0e80f AC |
3525 | } |
3526 | ||
25289eb2 | 3527 | if (lp && lp->signalled && lp->last_resume_kind != resume_stop) |
d6b0e80f AC |
3528 | { |
3529 | /* A pending SIGSTOP may interfere with the normal stream of | |
3530 | events. In a typical case where interference is a problem, | |
3531 | we have a SIGSTOP signal pending for LWP A while | |
3532 | single-stepping it, encounter an event in LWP B, and take the | |
3533 | pending SIGSTOP while trying to stop LWP A. After processing | |
3534 | the event in LWP B, LWP A is continued, and we'll never see | |
3535 | the SIGTRAP associated with the last time we were | |
3536 | single-stepping LWP A. */ | |
3537 | ||
3538 | /* Resume the thread. It should halt immediately returning the | |
3539 | pending SIGSTOP. */ | |
3540 | registers_changed (); | |
28439f5e | 3541 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
10d6c8cd | 3542 | lp->step, TARGET_SIGNAL_0); |
d6b0e80f AC |
3543 | if (debug_linux_nat) |
3544 | fprintf_unfiltered (gdb_stdlog, | |
3545 | "LLW: %s %s, 0, 0 (expect SIGSTOP)\n", | |
3546 | lp->step ? "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
3547 | target_pid_to_str (lp->ptid)); | |
3548 | lp->stopped = 0; | |
3549 | gdb_assert (lp->resumed); | |
3550 | ||
ca2163eb PA |
3551 | /* Catch the pending SIGSTOP. */ |
3552 | status = lp->status; | |
3553 | lp->status = 0; | |
3554 | ||
d6b0e80f | 3555 | stop_wait_callback (lp, NULL); |
ca2163eb PA |
3556 | |
3557 | /* If the lp->status field isn't empty, we caught another signal | |
3558 | while flushing the SIGSTOP. Return it back to the event | |
3559 | queue of the LWP, as we already have an event to handle. */ | |
3560 | if (lp->status) | |
3561 | { | |
3562 | if (debug_linux_nat) | |
3563 | fprintf_unfiltered (gdb_stdlog, | |
3564 | "LLW: kill %s, %s\n", | |
3565 | target_pid_to_str (lp->ptid), | |
3566 | status_to_str (lp->status)); | |
3567 | kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (lp->status)); | |
3568 | } | |
3569 | ||
3570 | lp->status = status; | |
d6b0e80f AC |
3571 | } |
3572 | ||
b84876c2 PA |
3573 | if (!target_can_async_p ()) |
3574 | { | |
3575 | /* Causes SIGINT to be passed on to the attached process. */ | |
3576 | set_sigint_trap (); | |
b84876c2 | 3577 | } |
d6b0e80f | 3578 | |
0e5bf2a8 | 3579 | /* But if we don't find a pending event, we'll have to wait. */ |
7feb7d06 | 3580 | |
d90e17a7 | 3581 | while (lp == NULL) |
d6b0e80f AC |
3582 | { |
3583 | pid_t lwpid; | |
3584 | ||
0e5bf2a8 PA |
3585 | /* Always use -1 and WNOHANG, due to couple of a kernel/ptrace |
3586 | quirks: | |
3587 | ||
3588 | - If the thread group leader exits while other threads in the | |
3589 | thread group still exist, waitpid(TGID, ...) hangs. That | |
3590 | waitpid won't return an exit status until the other threads | |
3591 | in the group are reapped. | |
3592 | ||
3593 | - When a non-leader thread execs, that thread just vanishes | |
3594 | without reporting an exit (so we'd hang if we waited for it | |
3595 | explicitly in that case). The exec event is reported to | |
3596 | the TGID pid. */ | |
3597 | ||
3598 | errno = 0; | |
3599 | lwpid = my_waitpid (-1, &status, __WCLONE | WNOHANG); | |
3600 | if (lwpid == 0 || (lwpid == -1 && errno == ECHILD)) | |
3601 | lwpid = my_waitpid (-1, &status, WNOHANG); | |
3602 | ||
3603 | if (debug_linux_nat) | |
3604 | fprintf_unfiltered (gdb_stdlog, | |
3605 | "LNW: waitpid(-1, ...) returned %d, %s\n", | |
3606 | lwpid, errno ? safe_strerror (errno) : "ERRNO-OK"); | |
b84876c2 | 3607 | |
d6b0e80f AC |
3608 | if (lwpid > 0) |
3609 | { | |
12d9289a PA |
3610 | /* If this is true, then we paused LWPs momentarily, and may |
3611 | now have pending events to handle. */ | |
3612 | int new_pending; | |
3613 | ||
d6b0e80f AC |
3614 | if (debug_linux_nat) |
3615 | { | |
3616 | fprintf_unfiltered (gdb_stdlog, | |
3617 | "LLW: waitpid %ld received %s\n", | |
3618 | (long) lwpid, status_to_str (status)); | |
3619 | } | |
3620 | ||
0e5bf2a8 | 3621 | lp = linux_nat_filter_event (lwpid, status, &new_pending); |
d90e17a7 | 3622 | |
33355866 JK |
3623 | /* STATUS is now no longer valid, use LP->STATUS instead. */ |
3624 | status = 0; | |
3625 | ||
0e5bf2a8 | 3626 | if (lp && !ptid_match (lp->ptid, ptid)) |
d6b0e80f | 3627 | { |
e3e9f5a2 PA |
3628 | gdb_assert (lp->resumed); |
3629 | ||
d90e17a7 | 3630 | if (debug_linux_nat) |
3e43a32a MS |
3631 | fprintf (stderr, |
3632 | "LWP %ld got an event %06x, leaving pending.\n", | |
33355866 | 3633 | ptid_get_lwp (lp->ptid), lp->status); |
d90e17a7 | 3634 | |
ca2163eb | 3635 | if (WIFSTOPPED (lp->status)) |
d90e17a7 | 3636 | { |
ca2163eb | 3637 | if (WSTOPSIG (lp->status) != SIGSTOP) |
d90e17a7 | 3638 | { |
e3e9f5a2 PA |
3639 | /* Cancel breakpoint hits. The breakpoint may |
3640 | be removed before we fetch events from this | |
3641 | process to report to the core. It is best | |
3642 | not to assume the moribund breakpoints | |
3643 | heuristic always handles these cases --- it | |
3644 | could be too many events go through to the | |
3645 | core before this one is handled. All-stop | |
3646 | always cancels breakpoint hits in all | |
3647 | threads. */ | |
3648 | if (non_stop | |
00390b84 | 3649 | && linux_nat_lp_status_is_event (lp) |
e3e9f5a2 PA |
3650 | && cancel_breakpoint (lp)) |
3651 | { | |
3652 | /* Throw away the SIGTRAP. */ | |
3653 | lp->status = 0; | |
3654 | ||
3655 | if (debug_linux_nat) | |
3656 | fprintf (stderr, | |
3e43a32a MS |
3657 | "LLW: LWP %ld hit a breakpoint while" |
3658 | " waiting for another process;" | |
3659 | " cancelled it\n", | |
e3e9f5a2 PA |
3660 | ptid_get_lwp (lp->ptid)); |
3661 | } | |
3662 | lp->stopped = 1; | |
d90e17a7 PA |
3663 | } |
3664 | else | |
3665 | { | |
3666 | lp->stopped = 1; | |
3667 | lp->signalled = 0; | |
3668 | } | |
3669 | } | |
33355866 | 3670 | else if (WIFEXITED (lp->status) || WIFSIGNALED (lp->status)) |
d90e17a7 PA |
3671 | { |
3672 | if (debug_linux_nat) | |
3e43a32a MS |
3673 | fprintf (stderr, |
3674 | "Process %ld exited while stopping LWPs\n", | |
d90e17a7 PA |
3675 | ptid_get_lwp (lp->ptid)); |
3676 | ||
3677 | /* This was the last lwp in the process. Since | |
3678 | events are serialized to GDB core, and we can't | |
3679 | report this one right now, but GDB core and the | |
3680 | other target layers will want to be notified | |
3681 | about the exit code/signal, leave the status | |
3682 | pending for the next time we're able to report | |
3683 | it. */ | |
d90e17a7 PA |
3684 | |
3685 | /* Prevent trying to stop this thread again. We'll | |
3686 | never try to resume it because it has a pending | |
3687 | status. */ | |
3688 | lp->stopped = 1; | |
3689 | ||
3690 | /* Dead LWP's aren't expected to reported a pending | |
3691 | sigstop. */ | |
3692 | lp->signalled = 0; | |
3693 | ||
3694 | /* Store the pending event in the waitstatus as | |
3695 | well, because W_EXITCODE(0,0) == 0. */ | |
ca2163eb | 3696 | store_waitstatus (&lp->waitstatus, lp->status); |
d90e17a7 PA |
3697 | } |
3698 | ||
3699 | /* Keep looking. */ | |
3700 | lp = NULL; | |
d6b0e80f AC |
3701 | } |
3702 | ||
0e5bf2a8 | 3703 | if (new_pending) |
d90e17a7 | 3704 | { |
0e5bf2a8 PA |
3705 | /* Some LWP now has a pending event. Go all the way |
3706 | back to check it. */ | |
3707 | goto retry; | |
3708 | } | |
12d9289a | 3709 | |
0e5bf2a8 PA |
3710 | if (lp) |
3711 | { | |
3712 | /* We got an event to report to the core. */ | |
3713 | break; | |
d90e17a7 | 3714 | } |
0e5bf2a8 PA |
3715 | |
3716 | /* Retry until nothing comes out of waitpid. A single | |
3717 | SIGCHLD can indicate more than one child stopped. */ | |
3718 | continue; | |
d6b0e80f AC |
3719 | } |
3720 | ||
0e5bf2a8 PA |
3721 | /* Check for zombie thread group leaders. Those can't be reaped |
3722 | until all other threads in the thread group are. */ | |
3723 | check_zombie_leaders (); | |
d6b0e80f | 3724 | |
0e5bf2a8 PA |
3725 | /* If there are no resumed children left, bail. We'd be stuck |
3726 | forever in the sigsuspend call below otherwise. */ | |
3727 | if (iterate_over_lwps (ptid, resumed_callback, NULL) == NULL) | |
3728 | { | |
3729 | if (debug_linux_nat) | |
3730 | fprintf_unfiltered (gdb_stdlog, "LLW: exit (no resumed LWP)\n"); | |
b84876c2 | 3731 | |
0e5bf2a8 | 3732 | ourstatus->kind = TARGET_WAITKIND_NO_RESUMED; |
b84876c2 | 3733 | |
0e5bf2a8 PA |
3734 | if (!target_can_async_p ()) |
3735 | clear_sigint_trap (); | |
b84876c2 | 3736 | |
0e5bf2a8 PA |
3737 | restore_child_signals_mask (&prev_mask); |
3738 | return minus_one_ptid; | |
d6b0e80f | 3739 | } |
28736962 | 3740 | |
0e5bf2a8 PA |
3741 | /* No interesting event to report to the core. */ |
3742 | ||
3743 | if (target_options & TARGET_WNOHANG) | |
3744 | { | |
01124a23 | 3745 | if (debug_linux_nat) |
28736962 PA |
3746 | fprintf_unfiltered (gdb_stdlog, "LLW: exit (ignore)\n"); |
3747 | ||
0e5bf2a8 | 3748 | ourstatus->kind = TARGET_WAITKIND_IGNORE; |
28736962 PA |
3749 | restore_child_signals_mask (&prev_mask); |
3750 | return minus_one_ptid; | |
3751 | } | |
d6b0e80f AC |
3752 | |
3753 | /* We shouldn't end up here unless we want to try again. */ | |
d90e17a7 | 3754 | gdb_assert (lp == NULL); |
0e5bf2a8 PA |
3755 | |
3756 | /* Block until we get an event reported with SIGCHLD. */ | |
3757 | sigsuspend (&suspend_mask); | |
d6b0e80f AC |
3758 | } |
3759 | ||
b84876c2 | 3760 | if (!target_can_async_p ()) |
d26b5354 | 3761 | clear_sigint_trap (); |
d6b0e80f AC |
3762 | |
3763 | gdb_assert (lp); | |
3764 | ||
ca2163eb PA |
3765 | status = lp->status; |
3766 | lp->status = 0; | |
3767 | ||
d6b0e80f AC |
3768 | /* Don't report signals that GDB isn't interested in, such as |
3769 | signals that are neither printed nor stopped upon. Stopping all | |
3770 | threads can be a bit time-consuming so if we want decent | |
3771 | performance with heavily multi-threaded programs, especially when | |
3772 | they're using a high frequency timer, we'd better avoid it if we | |
3773 | can. */ | |
3774 | ||
3775 | if (WIFSTOPPED (status)) | |
3776 | { | |
423ec54c | 3777 | enum target_signal signo = target_signal_from_host (WSTOPSIG (status)); |
d6b0e80f | 3778 | |
2455069d UW |
3779 | /* When using hardware single-step, we need to report every signal. |
3780 | Otherwise, signals in pass_mask may be short-circuited. */ | |
d539ed7e | 3781 | if (!lp->step |
2455069d | 3782 | && WSTOPSIG (status) && sigismember (&pass_mask, WSTOPSIG (status))) |
d6b0e80f AC |
3783 | { |
3784 | /* FIMXE: kettenis/2001-06-06: Should we resume all threads | |
3785 | here? It is not clear we should. GDB may not expect | |
3786 | other threads to run. On the other hand, not resuming | |
3787 | newly attached threads may cause an unwanted delay in | |
3788 | getting them running. */ | |
3789 | registers_changed (); | |
28439f5e | 3790 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
10d6c8cd | 3791 | lp->step, signo); |
d6b0e80f AC |
3792 | if (debug_linux_nat) |
3793 | fprintf_unfiltered (gdb_stdlog, | |
3794 | "LLW: %s %s, %s (preempt 'handle')\n", | |
3795 | lp->step ? | |
3796 | "PTRACE_SINGLESTEP" : "PTRACE_CONT", | |
3797 | target_pid_to_str (lp->ptid), | |
423ec54c JK |
3798 | (signo != TARGET_SIGNAL_0 |
3799 | ? strsignal (target_signal_to_host (signo)) | |
3800 | : "0")); | |
d6b0e80f | 3801 | lp->stopped = 0; |
d6b0e80f AC |
3802 | goto retry; |
3803 | } | |
3804 | ||
1ad15515 | 3805 | if (!non_stop) |
d6b0e80f | 3806 | { |
1ad15515 PA |
3807 | /* Only do the below in all-stop, as we currently use SIGINT |
3808 | to implement target_stop (see linux_nat_stop) in | |
3809 | non-stop. */ | |
3810 | if (signo == TARGET_SIGNAL_INT && signal_pass_state (signo) == 0) | |
3811 | { | |
3812 | /* If ^C/BREAK is typed at the tty/console, SIGINT gets | |
3813 | forwarded to the entire process group, that is, all LWPs | |
3814 | will receive it - unless they're using CLONE_THREAD to | |
3815 | share signals. Since we only want to report it once, we | |
3816 | mark it as ignored for all LWPs except this one. */ | |
d90e17a7 PA |
3817 | iterate_over_lwps (pid_to_ptid (ptid_get_pid (ptid)), |
3818 | set_ignore_sigint, NULL); | |
1ad15515 PA |
3819 | lp->ignore_sigint = 0; |
3820 | } | |
3821 | else | |
3822 | maybe_clear_ignore_sigint (lp); | |
d6b0e80f AC |
3823 | } |
3824 | } | |
3825 | ||
3826 | /* This LWP is stopped now. */ | |
3827 | lp->stopped = 1; | |
3828 | ||
3829 | if (debug_linux_nat) | |
3830 | fprintf_unfiltered (gdb_stdlog, "LLW: Candidate event %s in %s.\n", | |
3831 | status_to_str (status), target_pid_to_str (lp->ptid)); | |
3832 | ||
4c28f408 PA |
3833 | if (!non_stop) |
3834 | { | |
3835 | /* Now stop all other LWP's ... */ | |
d90e17a7 | 3836 | iterate_over_lwps (minus_one_ptid, stop_callback, NULL); |
4c28f408 PA |
3837 | |
3838 | /* ... and wait until all of them have reported back that | |
3839 | they're no longer running. */ | |
d90e17a7 | 3840 | iterate_over_lwps (minus_one_ptid, stop_wait_callback, NULL); |
4c28f408 PA |
3841 | |
3842 | /* If we're not waiting for a specific LWP, choose an event LWP | |
3843 | from among those that have had events. Giving equal priority | |
3844 | to all LWPs that have had events helps prevent | |
3845 | starvation. */ | |
0e5bf2a8 | 3846 | if (ptid_equal (ptid, minus_one_ptid) || ptid_is_pid (ptid)) |
d90e17a7 | 3847 | select_event_lwp (ptid, &lp, &status); |
d6b0e80f | 3848 | |
e3e9f5a2 PA |
3849 | /* Now that we've selected our final event LWP, cancel any |
3850 | breakpoints in other LWPs that have hit a GDB breakpoint. | |
3851 | See the comment in cancel_breakpoints_callback to find out | |
3852 | why. */ | |
3853 | iterate_over_lwps (minus_one_ptid, cancel_breakpoints_callback, lp); | |
3854 | ||
4b60df3d PA |
3855 | /* We'll need this to determine whether to report a SIGSTOP as |
3856 | TARGET_WAITKIND_0. Need to take a copy because | |
3857 | resume_clear_callback clears it. */ | |
3858 | last_resume_kind = lp->last_resume_kind; | |
3859 | ||
e3e9f5a2 PA |
3860 | /* In all-stop, from the core's perspective, all LWPs are now |
3861 | stopped until a new resume action is sent over. */ | |
3862 | iterate_over_lwps (minus_one_ptid, resume_clear_callback, NULL); | |
3863 | } | |
3864 | else | |
25289eb2 | 3865 | { |
4b60df3d PA |
3866 | /* See above. */ |
3867 | last_resume_kind = lp->last_resume_kind; | |
3868 | resume_clear_callback (lp, NULL); | |
25289eb2 | 3869 | } |
d6b0e80f | 3870 | |
26ab7092 | 3871 | if (linux_nat_status_is_event (status)) |
d6b0e80f | 3872 | { |
d6b0e80f AC |
3873 | if (debug_linux_nat) |
3874 | fprintf_unfiltered (gdb_stdlog, | |
4fdebdd0 PA |
3875 | "LLW: trap ptid is %s.\n", |
3876 | target_pid_to_str (lp->ptid)); | |
d6b0e80f | 3877 | } |
d6b0e80f AC |
3878 | |
3879 | if (lp->waitstatus.kind != TARGET_WAITKIND_IGNORE) | |
3880 | { | |
3881 | *ourstatus = lp->waitstatus; | |
3882 | lp->waitstatus.kind = TARGET_WAITKIND_IGNORE; | |
3883 | } | |
3884 | else | |
3885 | store_waitstatus (ourstatus, status); | |
3886 | ||
01124a23 | 3887 | if (debug_linux_nat) |
b84876c2 PA |
3888 | fprintf_unfiltered (gdb_stdlog, "LLW: exit\n"); |
3889 | ||
7feb7d06 | 3890 | restore_child_signals_mask (&prev_mask); |
1e225492 | 3891 | |
4b60df3d | 3892 | if (last_resume_kind == resume_stop |
25289eb2 PA |
3893 | && ourstatus->kind == TARGET_WAITKIND_STOPPED |
3894 | && WSTOPSIG (status) == SIGSTOP) | |
3895 | { | |
3896 | /* A thread that has been requested to stop by GDB with | |
3897 | target_stop, and it stopped cleanly, so report as SIG0. The | |
3898 | use of SIGSTOP is an implementation detail. */ | |
3899 | ourstatus->value.sig = TARGET_SIGNAL_0; | |
3900 | } | |
3901 | ||
1e225492 JK |
3902 | if (ourstatus->kind == TARGET_WAITKIND_EXITED |
3903 | || ourstatus->kind == TARGET_WAITKIND_SIGNALLED) | |
3904 | lp->core = -1; | |
3905 | else | |
3906 | lp->core = linux_nat_core_of_thread_1 (lp->ptid); | |
3907 | ||
f973ed9c | 3908 | return lp->ptid; |
d6b0e80f AC |
3909 | } |
3910 | ||
e3e9f5a2 PA |
3911 | /* Resume LWPs that are currently stopped without any pending status |
3912 | to report, but are resumed from the core's perspective. */ | |
3913 | ||
3914 | static int | |
3915 | resume_stopped_resumed_lwps (struct lwp_info *lp, void *data) | |
3916 | { | |
3917 | ptid_t *wait_ptid_p = data; | |
3918 | ||
3919 | if (lp->stopped | |
3920 | && lp->resumed | |
3921 | && lp->status == 0 | |
3922 | && lp->waitstatus.kind == TARGET_WAITKIND_IGNORE) | |
3923 | { | |
336060f3 PA |
3924 | struct regcache *regcache = get_thread_regcache (lp->ptid); |
3925 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
3926 | CORE_ADDR pc = regcache_read_pc (regcache); | |
3927 | ||
e3e9f5a2 PA |
3928 | gdb_assert (is_executing (lp->ptid)); |
3929 | ||
3930 | /* Don't bother if there's a breakpoint at PC that we'd hit | |
3931 | immediately, and we're not waiting for this LWP. */ | |
3932 | if (!ptid_match (lp->ptid, *wait_ptid_p)) | |
3933 | { | |
e3e9f5a2 PA |
3934 | if (breakpoint_inserted_here_p (get_regcache_aspace (regcache), pc)) |
3935 | return 0; | |
3936 | } | |
3937 | ||
3938 | if (debug_linux_nat) | |
3939 | fprintf_unfiltered (gdb_stdlog, | |
336060f3 PA |
3940 | "RSRL: resuming stopped-resumed LWP %s at %s: step=%d\n", |
3941 | target_pid_to_str (lp->ptid), | |
3942 | paddress (gdbarch, pc), | |
3943 | lp->step); | |
e3e9f5a2 | 3944 | |
336060f3 | 3945 | registers_changed (); |
e3e9f5a2 PA |
3946 | linux_ops->to_resume (linux_ops, pid_to_ptid (GET_LWP (lp->ptid)), |
3947 | lp->step, TARGET_SIGNAL_0); | |
3948 | lp->stopped = 0; | |
3949 | memset (&lp->siginfo, 0, sizeof (lp->siginfo)); | |
3950 | lp->stopped_by_watchpoint = 0; | |
3951 | } | |
3952 | ||
3953 | return 0; | |
3954 | } | |
3955 | ||
7feb7d06 PA |
3956 | static ptid_t |
3957 | linux_nat_wait (struct target_ops *ops, | |
47608cb1 PA |
3958 | ptid_t ptid, struct target_waitstatus *ourstatus, |
3959 | int target_options) | |
7feb7d06 PA |
3960 | { |
3961 | ptid_t event_ptid; | |
3962 | ||
3963 | if (debug_linux_nat) | |
3e43a32a MS |
3964 | fprintf_unfiltered (gdb_stdlog, |
3965 | "linux_nat_wait: [%s]\n", target_pid_to_str (ptid)); | |
7feb7d06 PA |
3966 | |
3967 | /* Flush the async file first. */ | |
3968 | if (target_can_async_p ()) | |
3969 | async_file_flush (); | |
3970 | ||
e3e9f5a2 PA |
3971 | /* Resume LWPs that are currently stopped without any pending status |
3972 | to report, but are resumed from the core's perspective. LWPs get | |
3973 | in this state if we find them stopping at a time we're not | |
3974 | interested in reporting the event (target_wait on a | |
3975 | specific_process, for example, see linux_nat_wait_1), and | |
3976 | meanwhile the event became uninteresting. Don't bother resuming | |
3977 | LWPs we're not going to wait for if they'd stop immediately. */ | |
3978 | if (non_stop) | |
3979 | iterate_over_lwps (minus_one_ptid, resume_stopped_resumed_lwps, &ptid); | |
3980 | ||
47608cb1 | 3981 | event_ptid = linux_nat_wait_1 (ops, ptid, ourstatus, target_options); |
7feb7d06 PA |
3982 | |
3983 | /* If we requested any event, and something came out, assume there | |
3984 | may be more. If we requested a specific lwp or process, also | |
3985 | assume there may be more. */ | |
3986 | if (target_can_async_p () | |
6953d224 PA |
3987 | && ((ourstatus->kind != TARGET_WAITKIND_IGNORE |
3988 | && ourstatus->kind != TARGET_WAITKIND_NO_RESUMED) | |
7feb7d06 PA |
3989 | || !ptid_equal (ptid, minus_one_ptid))) |
3990 | async_file_mark (); | |
3991 | ||
3992 | /* Get ready for the next event. */ | |
3993 | if (target_can_async_p ()) | |
3994 | target_async (inferior_event_handler, 0); | |
3995 | ||
3996 | return event_ptid; | |
3997 | } | |
3998 | ||
d6b0e80f AC |
3999 | static int |
4000 | kill_callback (struct lwp_info *lp, void *data) | |
4001 | { | |
ed731959 JK |
4002 | /* PTRACE_KILL may resume the inferior. Send SIGKILL first. */ |
4003 | ||
4004 | errno = 0; | |
4005 | kill (GET_LWP (lp->ptid), SIGKILL); | |
4006 | if (debug_linux_nat) | |
4007 | fprintf_unfiltered (gdb_stdlog, | |
4008 | "KC: kill (SIGKILL) %s, 0, 0 (%s)\n", | |
4009 | target_pid_to_str (lp->ptid), | |
4010 | errno ? safe_strerror (errno) : "OK"); | |
4011 | ||
4012 | /* Some kernels ignore even SIGKILL for processes under ptrace. */ | |
4013 | ||
d6b0e80f AC |
4014 | errno = 0; |
4015 | ptrace (PTRACE_KILL, GET_LWP (lp->ptid), 0, 0); | |
4016 | if (debug_linux_nat) | |
4017 | fprintf_unfiltered (gdb_stdlog, | |
4018 | "KC: PTRACE_KILL %s, 0, 0 (%s)\n", | |
4019 | target_pid_to_str (lp->ptid), | |
4020 | errno ? safe_strerror (errno) : "OK"); | |
4021 | ||
4022 | return 0; | |
4023 | } | |
4024 | ||
4025 | static int | |
4026 | kill_wait_callback (struct lwp_info *lp, void *data) | |
4027 | { | |
4028 | pid_t pid; | |
4029 | ||
4030 | /* We must make sure that there are no pending events (delayed | |
4031 | SIGSTOPs, pending SIGTRAPs, etc.) to make sure the current | |
4032 | program doesn't interfere with any following debugging session. */ | |
4033 | ||
4034 | /* For cloned processes we must check both with __WCLONE and | |
4035 | without, since the exit status of a cloned process isn't reported | |
4036 | with __WCLONE. */ | |
4037 | if (lp->cloned) | |
4038 | { | |
4039 | do | |
4040 | { | |
58aecb61 | 4041 | pid = my_waitpid (GET_LWP (lp->ptid), NULL, __WCLONE); |
e85a822c | 4042 | if (pid != (pid_t) -1) |
d6b0e80f | 4043 | { |
e85a822c DJ |
4044 | if (debug_linux_nat) |
4045 | fprintf_unfiltered (gdb_stdlog, | |
4046 | "KWC: wait %s received unknown.\n", | |
4047 | target_pid_to_str (lp->ptid)); | |
4048 | /* The Linux kernel sometimes fails to kill a thread | |
4049 | completely after PTRACE_KILL; that goes from the stop | |
4050 | point in do_fork out to the one in | |
4051 | get_signal_to_deliever and waits again. So kill it | |
4052 | again. */ | |
4053 | kill_callback (lp, NULL); | |
d6b0e80f AC |
4054 | } |
4055 | } | |
4056 | while (pid == GET_LWP (lp->ptid)); | |
4057 | ||
4058 | gdb_assert (pid == -1 && errno == ECHILD); | |
4059 | } | |
4060 | ||
4061 | do | |
4062 | { | |
58aecb61 | 4063 | pid = my_waitpid (GET_LWP (lp->ptid), NULL, 0); |
e85a822c | 4064 | if (pid != (pid_t) -1) |
d6b0e80f | 4065 | { |
e85a822c DJ |
4066 | if (debug_linux_nat) |
4067 | fprintf_unfiltered (gdb_stdlog, | |
4068 | "KWC: wait %s received unk.\n", | |
4069 | target_pid_to_str (lp->ptid)); | |
4070 | /* See the call to kill_callback above. */ | |
4071 | kill_callback (lp, NULL); | |
d6b0e80f AC |
4072 | } |
4073 | } | |
4074 | while (pid == GET_LWP (lp->ptid)); | |
4075 | ||
4076 | gdb_assert (pid == -1 && errno == ECHILD); | |
4077 | return 0; | |
4078 | } | |
4079 | ||
4080 | static void | |
7d85a9c0 | 4081 | linux_nat_kill (struct target_ops *ops) |
d6b0e80f | 4082 | { |
f973ed9c DJ |
4083 | struct target_waitstatus last; |
4084 | ptid_t last_ptid; | |
4085 | int status; | |
d6b0e80f | 4086 | |
f973ed9c DJ |
4087 | /* If we're stopped while forking and we haven't followed yet, |
4088 | kill the other task. We need to do this first because the | |
4089 | parent will be sleeping if this is a vfork. */ | |
d6b0e80f | 4090 | |
f973ed9c | 4091 | get_last_target_status (&last_ptid, &last); |
d6b0e80f | 4092 | |
f973ed9c DJ |
4093 | if (last.kind == TARGET_WAITKIND_FORKED |
4094 | || last.kind == TARGET_WAITKIND_VFORKED) | |
4095 | { | |
3a3e9ee3 | 4096 | ptrace (PT_KILL, PIDGET (last.value.related_pid), 0, 0); |
f973ed9c DJ |
4097 | wait (&status); |
4098 | } | |
4099 | ||
4100 | if (forks_exist_p ()) | |
7feb7d06 | 4101 | linux_fork_killall (); |
f973ed9c DJ |
4102 | else |
4103 | { | |
d90e17a7 | 4104 | ptid_t ptid = pid_to_ptid (ptid_get_pid (inferior_ptid)); |
e0881a8e | 4105 | |
4c28f408 PA |
4106 | /* Stop all threads before killing them, since ptrace requires |
4107 | that the thread is stopped to sucessfully PTRACE_KILL. */ | |
d90e17a7 | 4108 | iterate_over_lwps (ptid, stop_callback, NULL); |
4c28f408 PA |
4109 | /* ... and wait until all of them have reported back that |
4110 | they're no longer running. */ | |
d90e17a7 | 4111 | iterate_over_lwps (ptid, stop_wait_callback, NULL); |
4c28f408 | 4112 | |
f973ed9c | 4113 | /* Kill all LWP's ... */ |
d90e17a7 | 4114 | iterate_over_lwps (ptid, kill_callback, NULL); |
f973ed9c DJ |
4115 | |
4116 | /* ... and wait until we've flushed all events. */ | |
d90e17a7 | 4117 | iterate_over_lwps (ptid, kill_wait_callback, NULL); |
f973ed9c DJ |
4118 | } |
4119 | ||
4120 | target_mourn_inferior (); | |
d6b0e80f AC |
4121 | } |
4122 | ||
4123 | static void | |
136d6dae | 4124 | linux_nat_mourn_inferior (struct target_ops *ops) |
d6b0e80f | 4125 | { |
d90e17a7 | 4126 | purge_lwp_list (ptid_get_pid (inferior_ptid)); |
d6b0e80f | 4127 | |
f973ed9c | 4128 | if (! forks_exist_p ()) |
d90e17a7 PA |
4129 | /* Normal case, no other forks available. */ |
4130 | linux_ops->to_mourn_inferior (ops); | |
f973ed9c DJ |
4131 | else |
4132 | /* Multi-fork case. The current inferior_ptid has exited, but | |
4133 | there are other viable forks to debug. Delete the exiting | |
4134 | one and context-switch to the first available. */ | |
4135 | linux_fork_mourn_inferior (); | |
d6b0e80f AC |
4136 | } |
4137 | ||
5b009018 PA |
4138 | /* Convert a native/host siginfo object, into/from the siginfo in the |
4139 | layout of the inferiors' architecture. */ | |
4140 | ||
4141 | static void | |
4142 | siginfo_fixup (struct siginfo *siginfo, gdb_byte *inf_siginfo, int direction) | |
4143 | { | |
4144 | int done = 0; | |
4145 | ||
4146 | if (linux_nat_siginfo_fixup != NULL) | |
4147 | done = linux_nat_siginfo_fixup (siginfo, inf_siginfo, direction); | |
4148 | ||
4149 | /* If there was no callback, or the callback didn't do anything, | |
4150 | then just do a straight memcpy. */ | |
4151 | if (!done) | |
4152 | { | |
4153 | if (direction == 1) | |
4154 | memcpy (siginfo, inf_siginfo, sizeof (struct siginfo)); | |
4155 | else | |
4156 | memcpy (inf_siginfo, siginfo, sizeof (struct siginfo)); | |
4157 | } | |
4158 | } | |
4159 | ||
4aa995e1 PA |
4160 | static LONGEST |
4161 | linux_xfer_siginfo (struct target_ops *ops, enum target_object object, | |
4162 | const char *annex, gdb_byte *readbuf, | |
4163 | const gdb_byte *writebuf, ULONGEST offset, LONGEST len) | |
4164 | { | |
4aa995e1 PA |
4165 | int pid; |
4166 | struct siginfo siginfo; | |
5b009018 | 4167 | gdb_byte inf_siginfo[sizeof (struct siginfo)]; |
4aa995e1 PA |
4168 | |
4169 | gdb_assert (object == TARGET_OBJECT_SIGNAL_INFO); | |
4170 | gdb_assert (readbuf || writebuf); | |
4171 | ||
4172 | pid = GET_LWP (inferior_ptid); | |
4173 | if (pid == 0) | |
4174 | pid = GET_PID (inferior_ptid); | |
4175 | ||
4176 | if (offset > sizeof (siginfo)) | |
4177 | return -1; | |
4178 | ||
4179 | errno = 0; | |
4180 | ptrace (PTRACE_GETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo); | |
4181 | if (errno != 0) | |
4182 | return -1; | |
4183 | ||
5b009018 PA |
4184 | /* When GDB is built as a 64-bit application, ptrace writes into |
4185 | SIGINFO an object with 64-bit layout. Since debugging a 32-bit | |
4186 | inferior with a 64-bit GDB should look the same as debugging it | |
4187 | with a 32-bit GDB, we need to convert it. GDB core always sees | |
4188 | the converted layout, so any read/write will have to be done | |
4189 | post-conversion. */ | |
4190 | siginfo_fixup (&siginfo, inf_siginfo, 0); | |
4191 | ||
4aa995e1 PA |
4192 | if (offset + len > sizeof (siginfo)) |
4193 | len = sizeof (siginfo) - offset; | |
4194 | ||
4195 | if (readbuf != NULL) | |
5b009018 | 4196 | memcpy (readbuf, inf_siginfo + offset, len); |
4aa995e1 PA |
4197 | else |
4198 | { | |
5b009018 PA |
4199 | memcpy (inf_siginfo + offset, writebuf, len); |
4200 | ||
4201 | /* Convert back to ptrace layout before flushing it out. */ | |
4202 | siginfo_fixup (&siginfo, inf_siginfo, 1); | |
4203 | ||
4aa995e1 PA |
4204 | errno = 0; |
4205 | ptrace (PTRACE_SETSIGINFO, pid, (PTRACE_TYPE_ARG3) 0, &siginfo); | |
4206 | if (errno != 0) | |
4207 | return -1; | |
4208 | } | |
4209 | ||
4210 | return len; | |
4211 | } | |
4212 | ||
10d6c8cd DJ |
4213 | static LONGEST |
4214 | linux_nat_xfer_partial (struct target_ops *ops, enum target_object object, | |
4215 | const char *annex, gdb_byte *readbuf, | |
4216 | const gdb_byte *writebuf, | |
4217 | ULONGEST offset, LONGEST len) | |
d6b0e80f | 4218 | { |
4aa995e1 | 4219 | struct cleanup *old_chain; |
10d6c8cd | 4220 | LONGEST xfer; |
d6b0e80f | 4221 | |
4aa995e1 PA |
4222 | if (object == TARGET_OBJECT_SIGNAL_INFO) |
4223 | return linux_xfer_siginfo (ops, object, annex, readbuf, writebuf, | |
4224 | offset, len); | |
4225 | ||
c35b1492 PA |
4226 | /* The target is connected but no live inferior is selected. Pass |
4227 | this request down to a lower stratum (e.g., the executable | |
4228 | file). */ | |
4229 | if (object == TARGET_OBJECT_MEMORY && ptid_equal (inferior_ptid, null_ptid)) | |
4230 | return 0; | |
4231 | ||
4aa995e1 PA |
4232 | old_chain = save_inferior_ptid (); |
4233 | ||
d6b0e80f AC |
4234 | if (is_lwp (inferior_ptid)) |
4235 | inferior_ptid = pid_to_ptid (GET_LWP (inferior_ptid)); | |
4236 | ||
10d6c8cd DJ |
4237 | xfer = linux_ops->to_xfer_partial (ops, object, annex, readbuf, writebuf, |
4238 | offset, len); | |
d6b0e80f AC |
4239 | |
4240 | do_cleanups (old_chain); | |
4241 | return xfer; | |
4242 | } | |
4243 | ||
4244 | static int | |
28439f5e | 4245 | linux_thread_alive (ptid_t ptid) |
d6b0e80f | 4246 | { |
8c6a60d1 | 4247 | int err, tmp_errno; |
4c28f408 | 4248 | |
d6b0e80f AC |
4249 | gdb_assert (is_lwp (ptid)); |
4250 | ||
4c28f408 PA |
4251 | /* Send signal 0 instead of anything ptrace, because ptracing a |
4252 | running thread errors out claiming that the thread doesn't | |
4253 | exist. */ | |
4254 | err = kill_lwp (GET_LWP (ptid), 0); | |
8c6a60d1 | 4255 | tmp_errno = errno; |
d6b0e80f AC |
4256 | if (debug_linux_nat) |
4257 | fprintf_unfiltered (gdb_stdlog, | |
4c28f408 | 4258 | "LLTA: KILL(SIG0) %s (%s)\n", |
d6b0e80f | 4259 | target_pid_to_str (ptid), |
8c6a60d1 | 4260 | err ? safe_strerror (tmp_errno) : "OK"); |
9c0dd46b | 4261 | |
4c28f408 | 4262 | if (err != 0) |
d6b0e80f AC |
4263 | return 0; |
4264 | ||
4265 | return 1; | |
4266 | } | |
4267 | ||
28439f5e PA |
4268 | static int |
4269 | linux_nat_thread_alive (struct target_ops *ops, ptid_t ptid) | |
4270 | { | |
4271 | return linux_thread_alive (ptid); | |
4272 | } | |
4273 | ||
d6b0e80f | 4274 | static char * |
117de6a9 | 4275 | linux_nat_pid_to_str (struct target_ops *ops, ptid_t ptid) |
d6b0e80f AC |
4276 | { |
4277 | static char buf[64]; | |
4278 | ||
a0ef4274 | 4279 | if (is_lwp (ptid) |
d90e17a7 PA |
4280 | && (GET_PID (ptid) != GET_LWP (ptid) |
4281 | || num_lwps (GET_PID (ptid)) > 1)) | |
d6b0e80f AC |
4282 | { |
4283 | snprintf (buf, sizeof (buf), "LWP %ld", GET_LWP (ptid)); | |
4284 | return buf; | |
4285 | } | |
4286 | ||
4287 | return normal_pid_to_str (ptid); | |
4288 | } | |
4289 | ||
4694da01 TT |
4290 | static char * |
4291 | linux_nat_thread_name (struct thread_info *thr) | |
4292 | { | |
4293 | int pid = ptid_get_pid (thr->ptid); | |
4294 | long lwp = ptid_get_lwp (thr->ptid); | |
4295 | #define FORMAT "/proc/%d/task/%ld/comm" | |
4296 | char buf[sizeof (FORMAT) + 30]; | |
4297 | FILE *comm_file; | |
4298 | char *result = NULL; | |
4299 | ||
4300 | snprintf (buf, sizeof (buf), FORMAT, pid, lwp); | |
4301 | comm_file = fopen (buf, "r"); | |
4302 | if (comm_file) | |
4303 | { | |
4304 | /* Not exported by the kernel, so we define it here. */ | |
4305 | #define COMM_LEN 16 | |
4306 | static char line[COMM_LEN + 1]; | |
4307 | ||
4308 | if (fgets (line, sizeof (line), comm_file)) | |
4309 | { | |
4310 | char *nl = strchr (line, '\n'); | |
4311 | ||
4312 | if (nl) | |
4313 | *nl = '\0'; | |
4314 | if (*line != '\0') | |
4315 | result = line; | |
4316 | } | |
4317 | ||
4318 | fclose (comm_file); | |
4319 | } | |
4320 | ||
4321 | #undef COMM_LEN | |
4322 | #undef FORMAT | |
4323 | ||
4324 | return result; | |
4325 | } | |
4326 | ||
dba24537 AC |
4327 | /* Accepts an integer PID; Returns a string representing a file that |
4328 | can be opened to get the symbols for the child process. */ | |
4329 | ||
6d8fd2b7 UW |
4330 | static char * |
4331 | linux_child_pid_to_exec_file (int pid) | |
dba24537 AC |
4332 | { |
4333 | char *name1, *name2; | |
4334 | ||
4335 | name1 = xmalloc (MAXPATHLEN); | |
4336 | name2 = xmalloc (MAXPATHLEN); | |
4337 | make_cleanup (xfree, name1); | |
4338 | make_cleanup (xfree, name2); | |
4339 | memset (name2, 0, MAXPATHLEN); | |
4340 | ||
4341 | sprintf (name1, "/proc/%d/exe", pid); | |
4342 | if (readlink (name1, name2, MAXPATHLEN) > 0) | |
4343 | return name2; | |
4344 | else | |
4345 | return name1; | |
4346 | } | |
4347 | ||
4348 | /* Service function for corefiles and info proc. */ | |
4349 | ||
4350 | static int | |
4351 | read_mapping (FILE *mapfile, | |
4352 | long long *addr, | |
4353 | long long *endaddr, | |
4354 | char *permissions, | |
4355 | long long *offset, | |
4356 | char *device, long long *inode, char *filename) | |
4357 | { | |
4358 | int ret = fscanf (mapfile, "%llx-%llx %s %llx %s %llx", | |
4359 | addr, endaddr, permissions, offset, device, inode); | |
4360 | ||
2e14c2ea MS |
4361 | filename[0] = '\0'; |
4362 | if (ret > 0 && ret != EOF) | |
dba24537 AC |
4363 | { |
4364 | /* Eat everything up to EOL for the filename. This will prevent | |
4365 | weird filenames (such as one with embedded whitespace) from | |
4366 | confusing this code. It also makes this code more robust in | |
4367 | respect to annotations the kernel may add after the filename. | |
4368 | ||
4369 | Note the filename is used for informational purposes | |
4370 | only. */ | |
4371 | ret += fscanf (mapfile, "%[^\n]\n", filename); | |
4372 | } | |
2e14c2ea | 4373 | |
dba24537 AC |
4374 | return (ret != 0 && ret != EOF); |
4375 | } | |
4376 | ||
4377 | /* Fills the "to_find_memory_regions" target vector. Lists the memory | |
4378 | regions in the inferior for a corefile. */ | |
4379 | ||
4380 | static int | |
b8edc417 | 4381 | linux_nat_find_memory_regions (find_memory_region_ftype func, void *obfd) |
dba24537 | 4382 | { |
89ecc4f5 | 4383 | int pid = PIDGET (inferior_ptid); |
dba24537 AC |
4384 | char mapsfilename[MAXPATHLEN]; |
4385 | FILE *mapsfile; | |
4386 | long long addr, endaddr, size, offset, inode; | |
4387 | char permissions[8], device[8], filename[MAXPATHLEN]; | |
4388 | int read, write, exec; | |
7c8a8b04 | 4389 | struct cleanup *cleanup; |
dba24537 AC |
4390 | |
4391 | /* Compose the filename for the /proc memory map, and open it. */ | |
89ecc4f5 | 4392 | sprintf (mapsfilename, "/proc/%d/maps", pid); |
dba24537 | 4393 | if ((mapsfile = fopen (mapsfilename, "r")) == NULL) |
8a3fe4f8 | 4394 | error (_("Could not open %s."), mapsfilename); |
7c8a8b04 | 4395 | cleanup = make_cleanup_fclose (mapsfile); |
dba24537 AC |
4396 | |
4397 | if (info_verbose) | |
4398 | fprintf_filtered (gdb_stdout, | |
4399 | "Reading memory regions from %s\n", mapsfilename); | |
4400 | ||
4401 | /* Now iterate until end-of-file. */ | |
4402 | while (read_mapping (mapsfile, &addr, &endaddr, &permissions[0], | |
4403 | &offset, &device[0], &inode, &filename[0])) | |
4404 | { | |
4405 | size = endaddr - addr; | |
4406 | ||
4407 | /* Get the segment's permissions. */ | |
4408 | read = (strchr (permissions, 'r') != 0); | |
4409 | write = (strchr (permissions, 'w') != 0); | |
4410 | exec = (strchr (permissions, 'x') != 0); | |
4411 | ||
4412 | if (info_verbose) | |
4413 | { | |
4414 | fprintf_filtered (gdb_stdout, | |
2244ba2e PM |
4415 | "Save segment, %s bytes at %s (%c%c%c)", |
4416 | plongest (size), paddress (target_gdbarch, addr), | |
dba24537 AC |
4417 | read ? 'r' : ' ', |
4418 | write ? 'w' : ' ', exec ? 'x' : ' '); | |
b260b6c1 | 4419 | if (filename[0]) |
dba24537 AC |
4420 | fprintf_filtered (gdb_stdout, " for %s", filename); |
4421 | fprintf_filtered (gdb_stdout, "\n"); | |
4422 | } | |
4423 | ||
4424 | /* Invoke the callback function to create the corefile | |
4425 | segment. */ | |
4426 | func (addr, size, read, write, exec, obfd); | |
4427 | } | |
7c8a8b04 | 4428 | do_cleanups (cleanup); |
dba24537 AC |
4429 | return 0; |
4430 | } | |
4431 | ||
2020b7ab PA |
4432 | static int |
4433 | find_signalled_thread (struct thread_info *info, void *data) | |
4434 | { | |
16c381f0 | 4435 | if (info->suspend.stop_signal != TARGET_SIGNAL_0 |
2020b7ab PA |
4436 | && ptid_get_pid (info->ptid) == ptid_get_pid (inferior_ptid)) |
4437 | return 1; | |
4438 | ||
4439 | return 0; | |
4440 | } | |
4441 | ||
4442 | static enum target_signal | |
4443 | find_stop_signal (void) | |
4444 | { | |
4445 | struct thread_info *info = | |
4446 | iterate_over_threads (find_signalled_thread, NULL); | |
4447 | ||
4448 | if (info) | |
16c381f0 | 4449 | return info->suspend.stop_signal; |
2020b7ab PA |
4450 | else |
4451 | return TARGET_SIGNAL_0; | |
4452 | } | |
4453 | ||
dba24537 AC |
4454 | /* Records the thread's register state for the corefile note |
4455 | section. */ | |
4456 | ||
4457 | static char * | |
4458 | linux_nat_do_thread_registers (bfd *obfd, ptid_t ptid, | |
2020b7ab PA |
4459 | char *note_data, int *note_size, |
4460 | enum target_signal stop_signal) | |
dba24537 | 4461 | { |
dba24537 | 4462 | unsigned long lwp = ptid_get_lwp (ptid); |
c2250ad1 UW |
4463 | struct gdbarch *gdbarch = target_gdbarch; |
4464 | struct regcache *regcache = get_thread_arch_regcache (ptid, gdbarch); | |
4f844a66 | 4465 | const struct regset *regset; |
55e969c1 | 4466 | int core_regset_p; |
594f7785 | 4467 | struct cleanup *old_chain; |
17ea7499 CES |
4468 | struct core_regset_section *sect_list; |
4469 | char *gdb_regset; | |
594f7785 UW |
4470 | |
4471 | old_chain = save_inferior_ptid (); | |
4472 | inferior_ptid = ptid; | |
4473 | target_fetch_registers (regcache, -1); | |
4474 | do_cleanups (old_chain); | |
4f844a66 DM |
4475 | |
4476 | core_regset_p = gdbarch_regset_from_core_section_p (gdbarch); | |
17ea7499 CES |
4477 | sect_list = gdbarch_core_regset_sections (gdbarch); |
4478 | ||
17ea7499 CES |
4479 | /* The loop below uses the new struct core_regset_section, which stores |
4480 | the supported section names and sizes for the core file. Note that | |
4481 | note PRSTATUS needs to be treated specially. But the other notes are | |
4482 | structurally the same, so they can benefit from the new struct. */ | |
4483 | if (core_regset_p && sect_list != NULL) | |
4484 | while (sect_list->sect_name != NULL) | |
4485 | { | |
17ea7499 CES |
4486 | regset = gdbarch_regset_from_core_section (gdbarch, |
4487 | sect_list->sect_name, | |
4488 | sect_list->size); | |
4489 | gdb_assert (regset && regset->collect_regset); | |
4490 | gdb_regset = xmalloc (sect_list->size); | |
4491 | regset->collect_regset (regset, regcache, -1, | |
4492 | gdb_regset, sect_list->size); | |
2f2241f1 UW |
4493 | |
4494 | if (strcmp (sect_list->sect_name, ".reg") == 0) | |
4495 | note_data = (char *) elfcore_write_prstatus | |
4496 | (obfd, note_data, note_size, | |
857d11d0 JK |
4497 | lwp, target_signal_to_host (stop_signal), |
4498 | gdb_regset); | |
2f2241f1 UW |
4499 | else |
4500 | note_data = (char *) elfcore_write_register_note | |
4501 | (obfd, note_data, note_size, | |
4502 | sect_list->sect_name, gdb_regset, | |
4503 | sect_list->size); | |
17ea7499 CES |
4504 | xfree (gdb_regset); |
4505 | sect_list++; | |
4506 | } | |
dba24537 | 4507 | |
17ea7499 CES |
4508 | /* For architectures that does not have the struct core_regset_section |
4509 | implemented, we use the old method. When all the architectures have | |
4510 | the new support, the code below should be deleted. */ | |
4f844a66 | 4511 | else |
17ea7499 | 4512 | { |
2f2241f1 UW |
4513 | gdb_gregset_t gregs; |
4514 | gdb_fpregset_t fpregs; | |
4515 | ||
4516 | if (core_regset_p | |
4517 | && (regset = gdbarch_regset_from_core_section (gdbarch, ".reg", | |
3e43a32a MS |
4518 | sizeof (gregs))) |
4519 | != NULL && regset->collect_regset != NULL) | |
2f2241f1 UW |
4520 | regset->collect_regset (regset, regcache, -1, |
4521 | &gregs, sizeof (gregs)); | |
4522 | else | |
4523 | fill_gregset (regcache, &gregs, -1); | |
4524 | ||
857d11d0 JK |
4525 | note_data = (char *) elfcore_write_prstatus |
4526 | (obfd, note_data, note_size, lwp, target_signal_to_host (stop_signal), | |
4527 | &gregs); | |
2f2241f1 | 4528 | |
17ea7499 CES |
4529 | if (core_regset_p |
4530 | && (regset = gdbarch_regset_from_core_section (gdbarch, ".reg2", | |
3e43a32a MS |
4531 | sizeof (fpregs))) |
4532 | != NULL && regset->collect_regset != NULL) | |
17ea7499 CES |
4533 | regset->collect_regset (regset, regcache, -1, |
4534 | &fpregs, sizeof (fpregs)); | |
4535 | else | |
4536 | fill_fpregset (regcache, &fpregs, -1); | |
4537 | ||
4538 | note_data = (char *) elfcore_write_prfpreg (obfd, | |
4539 | note_data, | |
4540 | note_size, | |
4541 | &fpregs, sizeof (fpregs)); | |
4542 | } | |
4f844a66 | 4543 | |
dba24537 AC |
4544 | return note_data; |
4545 | } | |
4546 | ||
4547 | struct linux_nat_corefile_thread_data | |
4548 | { | |
4549 | bfd *obfd; | |
4550 | char *note_data; | |
4551 | int *note_size; | |
4552 | int num_notes; | |
2020b7ab | 4553 | enum target_signal stop_signal; |
dba24537 AC |
4554 | }; |
4555 | ||
4556 | /* Called by gdbthread.c once per thread. Records the thread's | |
4557 | register state for the corefile note section. */ | |
4558 | ||
4559 | static int | |
4560 | linux_nat_corefile_thread_callback (struct lwp_info *ti, void *data) | |
4561 | { | |
4562 | struct linux_nat_corefile_thread_data *args = data; | |
dba24537 | 4563 | |
dba24537 AC |
4564 | args->note_data = linux_nat_do_thread_registers (args->obfd, |
4565 | ti->ptid, | |
4566 | args->note_data, | |
2020b7ab PA |
4567 | args->note_size, |
4568 | args->stop_signal); | |
dba24537 | 4569 | args->num_notes++; |
56be3814 | 4570 | |
dba24537 AC |
4571 | return 0; |
4572 | } | |
4573 | ||
efcbbd14 UW |
4574 | /* Enumerate spufs IDs for process PID. */ |
4575 | ||
4576 | static void | |
4577 | iterate_over_spus (int pid, void (*callback) (void *, int), void *data) | |
4578 | { | |
4579 | char path[128]; | |
4580 | DIR *dir; | |
4581 | struct dirent *entry; | |
4582 | ||
4583 | xsnprintf (path, sizeof path, "/proc/%d/fd", pid); | |
4584 | dir = opendir (path); | |
4585 | if (!dir) | |
4586 | return; | |
4587 | ||
4588 | rewinddir (dir); | |
4589 | while ((entry = readdir (dir)) != NULL) | |
4590 | { | |
4591 | struct stat st; | |
4592 | struct statfs stfs; | |
4593 | int fd; | |
4594 | ||
4595 | fd = atoi (entry->d_name); | |
4596 | if (!fd) | |
4597 | continue; | |
4598 | ||
4599 | xsnprintf (path, sizeof path, "/proc/%d/fd/%d", pid, fd); | |
4600 | if (stat (path, &st) != 0) | |
4601 | continue; | |
4602 | if (!S_ISDIR (st.st_mode)) | |
4603 | continue; | |
4604 | ||
4605 | if (statfs (path, &stfs) != 0) | |
4606 | continue; | |
4607 | if (stfs.f_type != SPUFS_MAGIC) | |
4608 | continue; | |
4609 | ||
4610 | callback (data, fd); | |
4611 | } | |
4612 | ||
4613 | closedir (dir); | |
4614 | } | |
4615 | ||
4616 | /* Generate corefile notes for SPU contexts. */ | |
4617 | ||
4618 | struct linux_spu_corefile_data | |
4619 | { | |
4620 | bfd *obfd; | |
4621 | char *note_data; | |
4622 | int *note_size; | |
4623 | }; | |
4624 | ||
4625 | static void | |
4626 | linux_spu_corefile_callback (void *data, int fd) | |
4627 | { | |
4628 | struct linux_spu_corefile_data *args = data; | |
4629 | int i; | |
4630 | ||
4631 | static const char *spu_files[] = | |
4632 | { | |
4633 | "object-id", | |
4634 | "mem", | |
4635 | "regs", | |
4636 | "fpcr", | |
4637 | "lslr", | |
4638 | "decr", | |
4639 | "decr_status", | |
4640 | "signal1", | |
4641 | "signal1_type", | |
4642 | "signal2", | |
4643 | "signal2_type", | |
4644 | "event_mask", | |
4645 | "event_status", | |
4646 | "mbox_info", | |
4647 | "ibox_info", | |
4648 | "wbox_info", | |
4649 | "dma_info", | |
4650 | "proxydma_info", | |
4651 | }; | |
4652 | ||
4653 | for (i = 0; i < sizeof (spu_files) / sizeof (spu_files[0]); i++) | |
4654 | { | |
4655 | char annex[32], note_name[32]; | |
4656 | gdb_byte *spu_data; | |
4657 | LONGEST spu_len; | |
4658 | ||
4659 | xsnprintf (annex, sizeof annex, "%d/%s", fd, spu_files[i]); | |
4660 | spu_len = target_read_alloc (¤t_target, TARGET_OBJECT_SPU, | |
4661 | annex, &spu_data); | |
4662 | if (spu_len > 0) | |
4663 | { | |
4664 | xsnprintf (note_name, sizeof note_name, "SPU/%s", annex); | |
4665 | args->note_data = elfcore_write_note (args->obfd, args->note_data, | |
4666 | args->note_size, note_name, | |
4667 | NT_SPU, spu_data, spu_len); | |
4668 | xfree (spu_data); | |
4669 | } | |
4670 | } | |
4671 | } | |
4672 | ||
4673 | static char * | |
4674 | linux_spu_make_corefile_notes (bfd *obfd, char *note_data, int *note_size) | |
4675 | { | |
4676 | struct linux_spu_corefile_data args; | |
e0881a8e | 4677 | |
efcbbd14 UW |
4678 | args.obfd = obfd; |
4679 | args.note_data = note_data; | |
4680 | args.note_size = note_size; | |
4681 | ||
4682 | iterate_over_spus (PIDGET (inferior_ptid), | |
4683 | linux_spu_corefile_callback, &args); | |
4684 | ||
4685 | return args.note_data; | |
4686 | } | |
4687 | ||
dba24537 AC |
4688 | /* Fills the "to_make_corefile_note" target vector. Builds the note |
4689 | section for a corefile, and returns it in a malloc buffer. */ | |
4690 | ||
4691 | static char * | |
4692 | linux_nat_make_corefile_notes (bfd *obfd, int *note_size) | |
4693 | { | |
4694 | struct linux_nat_corefile_thread_data thread_args; | |
d99148ef | 4695 | /* The variable size must be >= sizeof (prpsinfo_t.pr_fname). */ |
dba24537 | 4696 | char fname[16] = { '\0' }; |
d99148ef | 4697 | /* The variable size must be >= sizeof (prpsinfo_t.pr_psargs). */ |
dba24537 AC |
4698 | char psargs[80] = { '\0' }; |
4699 | char *note_data = NULL; | |
d90e17a7 | 4700 | ptid_t filter = pid_to_ptid (ptid_get_pid (inferior_ptid)); |
c6826062 | 4701 | gdb_byte *auxv; |
dba24537 AC |
4702 | int auxv_len; |
4703 | ||
4704 | if (get_exec_file (0)) | |
4705 | { | |
9f37bbcc | 4706 | strncpy (fname, lbasename (get_exec_file (0)), sizeof (fname)); |
dba24537 AC |
4707 | strncpy (psargs, get_exec_file (0), sizeof (psargs)); |
4708 | if (get_inferior_args ()) | |
4709 | { | |
d99148ef JK |
4710 | char *string_end; |
4711 | char *psargs_end = psargs + sizeof (psargs); | |
4712 | ||
4713 | /* linux_elfcore_write_prpsinfo () handles zero unterminated | |
4714 | strings fine. */ | |
4715 | string_end = memchr (psargs, 0, sizeof (psargs)); | |
4716 | if (string_end != NULL) | |
4717 | { | |
4718 | *string_end++ = ' '; | |
4719 | strncpy (string_end, get_inferior_args (), | |
4720 | psargs_end - string_end); | |
4721 | } | |
dba24537 AC |
4722 | } |
4723 | note_data = (char *) elfcore_write_prpsinfo (obfd, | |
4724 | note_data, | |
4725 | note_size, fname, psargs); | |
4726 | } | |
4727 | ||
4728 | /* Dump information for threads. */ | |
4729 | thread_args.obfd = obfd; | |
4730 | thread_args.note_data = note_data; | |
4731 | thread_args.note_size = note_size; | |
4732 | thread_args.num_notes = 0; | |
2020b7ab | 4733 | thread_args.stop_signal = find_stop_signal (); |
d90e17a7 | 4734 | iterate_over_lwps (filter, linux_nat_corefile_thread_callback, &thread_args); |
2020b7ab PA |
4735 | gdb_assert (thread_args.num_notes != 0); |
4736 | note_data = thread_args.note_data; | |
dba24537 | 4737 | |
13547ab6 DJ |
4738 | auxv_len = target_read_alloc (¤t_target, TARGET_OBJECT_AUXV, |
4739 | NULL, &auxv); | |
dba24537 AC |
4740 | if (auxv_len > 0) |
4741 | { | |
4742 | note_data = elfcore_write_note (obfd, note_data, note_size, | |
4743 | "CORE", NT_AUXV, auxv, auxv_len); | |
4744 | xfree (auxv); | |
4745 | } | |
4746 | ||
efcbbd14 UW |
4747 | note_data = linux_spu_make_corefile_notes (obfd, note_data, note_size); |
4748 | ||
dba24537 AC |
4749 | make_cleanup (xfree, note_data); |
4750 | return note_data; | |
4751 | } | |
4752 | ||
4753 | /* Implement the "info proc" command. */ | |
4754 | ||
f179e162 JK |
4755 | enum info_proc_what |
4756 | { | |
4757 | /* Display the default cmdline, cwd and exe outputs. */ | |
4758 | IP_MINIMAL, | |
4759 | ||
4760 | /* Display `info proc mappings'. */ | |
4761 | IP_MAPPINGS, | |
4762 | ||
4763 | /* Display `info proc status'. */ | |
4764 | IP_STATUS, | |
4765 | ||
4766 | /* Display `info proc stat'. */ | |
4767 | IP_STAT, | |
4768 | ||
4769 | /* Display `info proc cmdline'. */ | |
4770 | IP_CMDLINE, | |
4771 | ||
4772 | /* Display `info proc exe'. */ | |
4773 | IP_EXE, | |
4774 | ||
4775 | /* Display `info proc cwd'. */ | |
4776 | IP_CWD, | |
4777 | ||
4778 | /* Display all of the above. */ | |
4779 | IP_ALL | |
4780 | }; | |
4781 | ||
dba24537 | 4782 | static void |
f179e162 | 4783 | linux_nat_info_proc_cmd_1 (char *args, enum info_proc_what what, int from_tty) |
dba24537 | 4784 | { |
89ecc4f5 DE |
4785 | /* A long is used for pid instead of an int to avoid a loss of precision |
4786 | compiler warning from the output of strtoul. */ | |
4787 | long pid = PIDGET (inferior_ptid); | |
dba24537 | 4788 | FILE *procfile; |
dba24537 AC |
4789 | char buffer[MAXPATHLEN]; |
4790 | char fname1[MAXPATHLEN], fname2[MAXPATHLEN]; | |
f179e162 JK |
4791 | int cmdline_f = (what == IP_MINIMAL || what == IP_CMDLINE || what == IP_ALL); |
4792 | int cwd_f = (what == IP_MINIMAL || what == IP_CWD || what == IP_ALL); | |
4793 | int exe_f = (what == IP_MINIMAL || what == IP_EXE || what == IP_ALL); | |
4794 | int mappings_f = (what == IP_MAPPINGS || what == IP_ALL); | |
4795 | int status_f = (what == IP_STATUS || what == IP_ALL); | |
4796 | int stat_f = (what == IP_STAT || what == IP_ALL); | |
dba24537 AC |
4797 | struct stat dummy; |
4798 | ||
f179e162 JK |
4799 | if (args && isdigit (args[0])) |
4800 | pid = strtoul (args, &args, 10); | |
4801 | ||
4802 | args = skip_spaces (args); | |
4803 | if (args && args[0]) | |
4804 | error (_("Too many parameters: %s"), args); | |
4805 | ||
dba24537 | 4806 | if (pid == 0) |
8a3fe4f8 | 4807 | error (_("No current process: you must name one.")); |
dba24537 | 4808 | |
89ecc4f5 | 4809 | sprintf (fname1, "/proc/%ld", pid); |
dba24537 | 4810 | if (stat (fname1, &dummy) != 0) |
8a3fe4f8 | 4811 | error (_("No /proc directory: '%s'"), fname1); |
dba24537 | 4812 | |
89ecc4f5 | 4813 | printf_filtered (_("process %ld\n"), pid); |
f179e162 | 4814 | if (cmdline_f) |
dba24537 | 4815 | { |
89ecc4f5 | 4816 | sprintf (fname1, "/proc/%ld/cmdline", pid); |
d5d6fca5 | 4817 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 | 4818 | { |
7c8a8b04 | 4819 | struct cleanup *cleanup = make_cleanup_fclose (procfile); |
e0881a8e | 4820 | |
bf1d7d9c JB |
4821 | if (fgets (buffer, sizeof (buffer), procfile)) |
4822 | printf_filtered ("cmdline = '%s'\n", buffer); | |
4823 | else | |
4824 | warning (_("unable to read '%s'"), fname1); | |
7c8a8b04 | 4825 | do_cleanups (cleanup); |
dba24537 AC |
4826 | } |
4827 | else | |
8a3fe4f8 | 4828 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 | 4829 | } |
f179e162 | 4830 | if (cwd_f) |
dba24537 | 4831 | { |
89ecc4f5 | 4832 | sprintf (fname1, "/proc/%ld/cwd", pid); |
dba24537 AC |
4833 | memset (fname2, 0, sizeof (fname2)); |
4834 | if (readlink (fname1, fname2, sizeof (fname2)) > 0) | |
4835 | printf_filtered ("cwd = '%s'\n", fname2); | |
4836 | else | |
8a3fe4f8 | 4837 | warning (_("unable to read link '%s'"), fname1); |
dba24537 | 4838 | } |
f179e162 | 4839 | if (exe_f) |
dba24537 | 4840 | { |
89ecc4f5 | 4841 | sprintf (fname1, "/proc/%ld/exe", pid); |
dba24537 AC |
4842 | memset (fname2, 0, sizeof (fname2)); |
4843 | if (readlink (fname1, fname2, sizeof (fname2)) > 0) | |
4844 | printf_filtered ("exe = '%s'\n", fname2); | |
4845 | else | |
8a3fe4f8 | 4846 | warning (_("unable to read link '%s'"), fname1); |
dba24537 | 4847 | } |
f179e162 | 4848 | if (mappings_f) |
dba24537 | 4849 | { |
89ecc4f5 | 4850 | sprintf (fname1, "/proc/%ld/maps", pid); |
d5d6fca5 | 4851 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 AC |
4852 | { |
4853 | long long addr, endaddr, size, offset, inode; | |
4854 | char permissions[8], device[8], filename[MAXPATHLEN]; | |
7c8a8b04 | 4855 | struct cleanup *cleanup; |
dba24537 | 4856 | |
7c8a8b04 | 4857 | cleanup = make_cleanup_fclose (procfile); |
a3f17187 | 4858 | printf_filtered (_("Mapped address spaces:\n\n")); |
a97b0ac8 | 4859 | if (gdbarch_addr_bit (target_gdbarch) == 32) |
dba24537 AC |
4860 | { |
4861 | printf_filtered ("\t%10s %10s %10s %10s %7s\n", | |
4862 | "Start Addr", | |
4863 | " End Addr", | |
4864 | " Size", " Offset", "objfile"); | |
4865 | } | |
4866 | else | |
4867 | { | |
4868 | printf_filtered (" %18s %18s %10s %10s %7s\n", | |
4869 | "Start Addr", | |
4870 | " End Addr", | |
4871 | " Size", " Offset", "objfile"); | |
4872 | } | |
4873 | ||
4874 | while (read_mapping (procfile, &addr, &endaddr, &permissions[0], | |
4875 | &offset, &device[0], &inode, &filename[0])) | |
4876 | { | |
4877 | size = endaddr - addr; | |
4878 | ||
4879 | /* FIXME: carlton/2003-08-27: Maybe the printf_filtered | |
4880 | calls here (and possibly above) should be abstracted | |
4881 | out into their own functions? Andrew suggests using | |
4882 | a generic local_address_string instead to print out | |
4883 | the addresses; that makes sense to me, too. */ | |
4884 | ||
a97b0ac8 | 4885 | if (gdbarch_addr_bit (target_gdbarch) == 32) |
dba24537 AC |
4886 | { |
4887 | printf_filtered ("\t%#10lx %#10lx %#10x %#10x %7s\n", | |
4888 | (unsigned long) addr, /* FIXME: pr_addr */ | |
4889 | (unsigned long) endaddr, | |
4890 | (int) size, | |
4891 | (unsigned int) offset, | |
4892 | filename[0] ? filename : ""); | |
4893 | } | |
4894 | else | |
4895 | { | |
4896 | printf_filtered (" %#18lx %#18lx %#10x %#10x %7s\n", | |
4897 | (unsigned long) addr, /* FIXME: pr_addr */ | |
4898 | (unsigned long) endaddr, | |
4899 | (int) size, | |
4900 | (unsigned int) offset, | |
4901 | filename[0] ? filename : ""); | |
4902 | } | |
4903 | } | |
4904 | ||
7c8a8b04 | 4905 | do_cleanups (cleanup); |
dba24537 AC |
4906 | } |
4907 | else | |
8a3fe4f8 | 4908 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 | 4909 | } |
f179e162 | 4910 | if (status_f) |
dba24537 | 4911 | { |
89ecc4f5 | 4912 | sprintf (fname1, "/proc/%ld/status", pid); |
d5d6fca5 | 4913 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 | 4914 | { |
7c8a8b04 | 4915 | struct cleanup *cleanup = make_cleanup_fclose (procfile); |
e0881a8e | 4916 | |
dba24537 AC |
4917 | while (fgets (buffer, sizeof (buffer), procfile) != NULL) |
4918 | puts_filtered (buffer); | |
7c8a8b04 | 4919 | do_cleanups (cleanup); |
dba24537 AC |
4920 | } |
4921 | else | |
8a3fe4f8 | 4922 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 | 4923 | } |
f179e162 | 4924 | if (stat_f) |
dba24537 | 4925 | { |
89ecc4f5 | 4926 | sprintf (fname1, "/proc/%ld/stat", pid); |
d5d6fca5 | 4927 | if ((procfile = fopen (fname1, "r")) != NULL) |
dba24537 AC |
4928 | { |
4929 | int itmp; | |
4930 | char ctmp; | |
a25694b4 | 4931 | long ltmp; |
7c8a8b04 | 4932 | struct cleanup *cleanup = make_cleanup_fclose (procfile); |
dba24537 AC |
4933 | |
4934 | if (fscanf (procfile, "%d ", &itmp) > 0) | |
a3f17187 | 4935 | printf_filtered (_("Process: %d\n"), itmp); |
a25694b4 | 4936 | if (fscanf (procfile, "(%[^)]) ", &buffer[0]) > 0) |
a3f17187 | 4937 | printf_filtered (_("Exec file: %s\n"), buffer); |
dba24537 | 4938 | if (fscanf (procfile, "%c ", &ctmp) > 0) |
a3f17187 | 4939 | printf_filtered (_("State: %c\n"), ctmp); |
dba24537 | 4940 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4941 | printf_filtered (_("Parent process: %d\n"), itmp); |
dba24537 | 4942 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4943 | printf_filtered (_("Process group: %d\n"), itmp); |
dba24537 | 4944 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4945 | printf_filtered (_("Session id: %d\n"), itmp); |
dba24537 | 4946 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4947 | printf_filtered (_("TTY: %d\n"), itmp); |
dba24537 | 4948 | if (fscanf (procfile, "%d ", &itmp) > 0) |
a3f17187 | 4949 | printf_filtered (_("TTY owner process group: %d\n"), itmp); |
a25694b4 AS |
4950 | if (fscanf (procfile, "%lu ", <mp) > 0) |
4951 | printf_filtered (_("Flags: 0x%lx\n"), ltmp); | |
4952 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4953 | printf_filtered (_("Minor faults (no memory page): %lu\n"), | |
4954 | (unsigned long) ltmp); | |
4955 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4956 | printf_filtered (_("Minor faults, children: %lu\n"), | |
4957 | (unsigned long) ltmp); | |
4958 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4959 | printf_filtered (_("Major faults (memory page faults): %lu\n"), | |
4960 | (unsigned long) ltmp); | |
4961 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4962 | printf_filtered (_("Major faults, children: %lu\n"), | |
4963 | (unsigned long) ltmp); | |
4964 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4965 | printf_filtered (_("utime: %ld\n"), ltmp); | |
4966 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4967 | printf_filtered (_("stime: %ld\n"), ltmp); | |
4968 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4969 | printf_filtered (_("utime, children: %ld\n"), ltmp); | |
4970 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
4971 | printf_filtered (_("stime, children: %ld\n"), ltmp); | |
4972 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
3e43a32a MS |
4973 | printf_filtered (_("jiffies remaining in current " |
4974 | "time slice: %ld\n"), ltmp); | |
a25694b4 AS |
4975 | if (fscanf (procfile, "%ld ", <mp) > 0) |
4976 | printf_filtered (_("'nice' value: %ld\n"), ltmp); | |
4977 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4978 | printf_filtered (_("jiffies until next timeout: %lu\n"), | |
4979 | (unsigned long) ltmp); | |
4980 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4981 | printf_filtered (_("jiffies until next SIGALRM: %lu\n"), | |
4982 | (unsigned long) ltmp); | |
4983 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
3e43a32a MS |
4984 | printf_filtered (_("start time (jiffies since " |
4985 | "system boot): %ld\n"), ltmp); | |
a25694b4 AS |
4986 | if (fscanf (procfile, "%lu ", <mp) > 0) |
4987 | printf_filtered (_("Virtual memory size: %lu\n"), | |
4988 | (unsigned long) ltmp); | |
4989 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
3e43a32a MS |
4990 | printf_filtered (_("Resident set size: %lu\n"), |
4991 | (unsigned long) ltmp); | |
a25694b4 AS |
4992 | if (fscanf (procfile, "%lu ", <mp) > 0) |
4993 | printf_filtered (_("rlim: %lu\n"), (unsigned long) ltmp); | |
4994 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4995 | printf_filtered (_("Start of text: 0x%lx\n"), ltmp); | |
4996 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4997 | printf_filtered (_("End of text: 0x%lx\n"), ltmp); | |
4998 | if (fscanf (procfile, "%lu ", <mp) > 0) | |
4999 | printf_filtered (_("Start of stack: 0x%lx\n"), ltmp); | |
3e43a32a MS |
5000 | #if 0 /* Don't know how architecture-dependent the rest is... |
5001 | Anyway the signal bitmap info is available from "status". */ | |
1777feb0 | 5002 | if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */ |
a25694b4 | 5003 | printf_filtered (_("Kernel stack pointer: 0x%lx\n"), ltmp); |
1777feb0 | 5004 | if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */ |
a25694b4 AS |
5005 | printf_filtered (_("Kernel instr pointer: 0x%lx\n"), ltmp); |
5006 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
5007 | printf_filtered (_("Pending signals bitmap: 0x%lx\n"), ltmp); | |
5008 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
5009 | printf_filtered (_("Blocked signals bitmap: 0x%lx\n"), ltmp); | |
5010 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
5011 | printf_filtered (_("Ignored signals bitmap: 0x%lx\n"), ltmp); | |
5012 | if (fscanf (procfile, "%ld ", <mp) > 0) | |
5013 | printf_filtered (_("Catched signals bitmap: 0x%lx\n"), ltmp); | |
1777feb0 | 5014 | if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */ |
a25694b4 | 5015 | printf_filtered (_("wchan (system call): 0x%lx\n"), ltmp); |
dba24537 | 5016 | #endif |
7c8a8b04 | 5017 | do_cleanups (cleanup); |
dba24537 AC |
5018 | } |
5019 | else | |
8a3fe4f8 | 5020 | warning (_("unable to open /proc file '%s'"), fname1); |
dba24537 AC |
5021 | } |
5022 | } | |
5023 | ||
f179e162 JK |
5024 | /* Implement `info proc' when given without any futher parameters. */ |
5025 | ||
5026 | static void | |
5027 | linux_nat_info_proc_cmd (char *args, int from_tty) | |
5028 | { | |
5029 | linux_nat_info_proc_cmd_1 (args, IP_MINIMAL, from_tty); | |
5030 | } | |
5031 | ||
5032 | /* Implement `info proc mappings'. */ | |
5033 | ||
5034 | static void | |
5035 | linux_nat_info_proc_cmd_mappings (char *args, int from_tty) | |
5036 | { | |
5037 | linux_nat_info_proc_cmd_1 (args, IP_MAPPINGS, from_tty); | |
5038 | } | |
5039 | ||
5040 | /* Implement `info proc stat'. */ | |
5041 | ||
5042 | static void | |
5043 | linux_nat_info_proc_cmd_stat (char *args, int from_tty) | |
5044 | { | |
5045 | linux_nat_info_proc_cmd_1 (args, IP_STAT, from_tty); | |
5046 | } | |
5047 | ||
5048 | /* Implement `info proc status'. */ | |
5049 | ||
5050 | static void | |
5051 | linux_nat_info_proc_cmd_status (char *args, int from_tty) | |
5052 | { | |
5053 | linux_nat_info_proc_cmd_1 (args, IP_STATUS, from_tty); | |
5054 | } | |
5055 | ||
5056 | /* Implement `info proc cwd'. */ | |
5057 | ||
5058 | static void | |
5059 | linux_nat_info_proc_cmd_cwd (char *args, int from_tty) | |
5060 | { | |
5061 | linux_nat_info_proc_cmd_1 (args, IP_CWD, from_tty); | |
5062 | } | |
5063 | ||
5064 | /* Implement `info proc cmdline'. */ | |
5065 | ||
5066 | static void | |
5067 | linux_nat_info_proc_cmd_cmdline (char *args, int from_tty) | |
5068 | { | |
5069 | linux_nat_info_proc_cmd_1 (args, IP_CMDLINE, from_tty); | |
5070 | } | |
5071 | ||
5072 | /* Implement `info proc exe'. */ | |
5073 | ||
5074 | static void | |
5075 | linux_nat_info_proc_cmd_exe (char *args, int from_tty) | |
5076 | { | |
5077 | linux_nat_info_proc_cmd_1 (args, IP_EXE, from_tty); | |
5078 | } | |
5079 | ||
5080 | /* Implement `info proc all'. */ | |
5081 | ||
5082 | static void | |
5083 | linux_nat_info_proc_cmd_all (char *args, int from_tty) | |
5084 | { | |
5085 | linux_nat_info_proc_cmd_1 (args, IP_ALL, from_tty); | |
5086 | } | |
5087 | ||
10d6c8cd DJ |
5088 | /* Implement the to_xfer_partial interface for memory reads using the /proc |
5089 | filesystem. Because we can use a single read() call for /proc, this | |
5090 | can be much more efficient than banging away at PTRACE_PEEKTEXT, | |
5091 | but it doesn't support writes. */ | |
5092 | ||
5093 | static LONGEST | |
5094 | linux_proc_xfer_partial (struct target_ops *ops, enum target_object object, | |
5095 | const char *annex, gdb_byte *readbuf, | |
5096 | const gdb_byte *writebuf, | |
5097 | ULONGEST offset, LONGEST len) | |
dba24537 | 5098 | { |
10d6c8cd DJ |
5099 | LONGEST ret; |
5100 | int fd; | |
dba24537 AC |
5101 | char filename[64]; |
5102 | ||
10d6c8cd | 5103 | if (object != TARGET_OBJECT_MEMORY || !readbuf) |
dba24537 AC |
5104 | return 0; |
5105 | ||
5106 | /* Don't bother for one word. */ | |
5107 | if (len < 3 * sizeof (long)) | |
5108 | return 0; | |
5109 | ||
5110 | /* We could keep this file open and cache it - possibly one per | |
5111 | thread. That requires some juggling, but is even faster. */ | |
5112 | sprintf (filename, "/proc/%d/mem", PIDGET (inferior_ptid)); | |
5113 | fd = open (filename, O_RDONLY | O_LARGEFILE); | |
5114 | if (fd == -1) | |
5115 | return 0; | |
5116 | ||
5117 | /* If pread64 is available, use it. It's faster if the kernel | |
5118 | supports it (only one syscall), and it's 64-bit safe even on | |
5119 | 32-bit platforms (for instance, SPARC debugging a SPARC64 | |
5120 | application). */ | |
5121 | #ifdef HAVE_PREAD64 | |
10d6c8cd | 5122 | if (pread64 (fd, readbuf, len, offset) != len) |
dba24537 | 5123 | #else |
10d6c8cd | 5124 | if (lseek (fd, offset, SEEK_SET) == -1 || read (fd, readbuf, len) != len) |
dba24537 AC |
5125 | #endif |
5126 | ret = 0; | |
5127 | else | |
5128 | ret = len; | |
5129 | ||
5130 | close (fd); | |
5131 | return ret; | |
5132 | } | |
5133 | ||
efcbbd14 UW |
5134 | |
5135 | /* Enumerate spufs IDs for process PID. */ | |
5136 | static LONGEST | |
5137 | spu_enumerate_spu_ids (int pid, gdb_byte *buf, ULONGEST offset, LONGEST len) | |
5138 | { | |
5139 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch); | |
5140 | LONGEST pos = 0; | |
5141 | LONGEST written = 0; | |
5142 | char path[128]; | |
5143 | DIR *dir; | |
5144 | struct dirent *entry; | |
5145 | ||
5146 | xsnprintf (path, sizeof path, "/proc/%d/fd", pid); | |
5147 | dir = opendir (path); | |
5148 | if (!dir) | |
5149 | return -1; | |
5150 | ||
5151 | rewinddir (dir); | |
5152 | while ((entry = readdir (dir)) != NULL) | |
5153 | { | |
5154 | struct stat st; | |
5155 | struct statfs stfs; | |
5156 | int fd; | |
5157 | ||
5158 | fd = atoi (entry->d_name); | |
5159 | if (!fd) | |
5160 | continue; | |
5161 | ||
5162 | xsnprintf (path, sizeof path, "/proc/%d/fd/%d", pid, fd); | |
5163 | if (stat (path, &st) != 0) | |
5164 | continue; | |
5165 | if (!S_ISDIR (st.st_mode)) | |
5166 | continue; | |
5167 | ||
5168 | if (statfs (path, &stfs) != 0) | |
5169 | continue; | |
5170 | if (stfs.f_type != SPUFS_MAGIC) | |
5171 | continue; | |
5172 | ||
5173 | if (pos >= offset && pos + 4 <= offset + len) | |
5174 | { | |
5175 | store_unsigned_integer (buf + pos - offset, 4, byte_order, fd); | |
5176 | written += 4; | |
5177 | } | |
5178 | pos += 4; | |
5179 | } | |
5180 | ||
5181 | closedir (dir); | |
5182 | return written; | |
5183 | } | |
5184 | ||
5185 | /* Implement the to_xfer_partial interface for the TARGET_OBJECT_SPU | |
5186 | object type, using the /proc file system. */ | |
5187 | static LONGEST | |
5188 | linux_proc_xfer_spu (struct target_ops *ops, enum target_object object, | |
5189 | const char *annex, gdb_byte *readbuf, | |
5190 | const gdb_byte *writebuf, | |
5191 | ULONGEST offset, LONGEST len) | |
5192 | { | |
5193 | char buf[128]; | |
5194 | int fd = 0; | |
5195 | int ret = -1; | |
5196 | int pid = PIDGET (inferior_ptid); | |
5197 | ||
5198 | if (!annex) | |
5199 | { | |
5200 | if (!readbuf) | |
5201 | return -1; | |
5202 | else | |
5203 | return spu_enumerate_spu_ids (pid, readbuf, offset, len); | |
5204 | } | |
5205 | ||
5206 | xsnprintf (buf, sizeof buf, "/proc/%d/fd/%s", pid, annex); | |
5207 | fd = open (buf, writebuf? O_WRONLY : O_RDONLY); | |
5208 | if (fd <= 0) | |
5209 | return -1; | |
5210 | ||
5211 | if (offset != 0 | |
5212 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) | |
5213 | { | |
5214 | close (fd); | |
5215 | return 0; | |
5216 | } | |
5217 | ||
5218 | if (writebuf) | |
5219 | ret = write (fd, writebuf, (size_t) len); | |
5220 | else if (readbuf) | |
5221 | ret = read (fd, readbuf, (size_t) len); | |
5222 | ||
5223 | close (fd); | |
5224 | return ret; | |
5225 | } | |
5226 | ||
5227 | ||
dba24537 AC |
5228 | /* Parse LINE as a signal set and add its set bits to SIGS. */ |
5229 | ||
5230 | static void | |
5231 | add_line_to_sigset (const char *line, sigset_t *sigs) | |
5232 | { | |
5233 | int len = strlen (line) - 1; | |
5234 | const char *p; | |
5235 | int signum; | |
5236 | ||
5237 | if (line[len] != '\n') | |
8a3fe4f8 | 5238 | error (_("Could not parse signal set: %s"), line); |
dba24537 AC |
5239 | |
5240 | p = line; | |
5241 | signum = len * 4; | |
5242 | while (len-- > 0) | |
5243 | { | |
5244 | int digit; | |
5245 | ||
5246 | if (*p >= '0' && *p <= '9') | |
5247 | digit = *p - '0'; | |
5248 | else if (*p >= 'a' && *p <= 'f') | |
5249 | digit = *p - 'a' + 10; | |
5250 | else | |
8a3fe4f8 | 5251 | error (_("Could not parse signal set: %s"), line); |
dba24537 AC |
5252 | |
5253 | signum -= 4; | |
5254 | ||
5255 | if (digit & 1) | |
5256 | sigaddset (sigs, signum + 1); | |
5257 | if (digit & 2) | |
5258 | sigaddset (sigs, signum + 2); | |
5259 | if (digit & 4) | |
5260 | sigaddset (sigs, signum + 3); | |
5261 | if (digit & 8) | |
5262 | sigaddset (sigs, signum + 4); | |
5263 | ||
5264 | p++; | |
5265 | } | |
5266 | } | |
5267 | ||
5268 | /* Find process PID's pending signals from /proc/pid/status and set | |
5269 | SIGS to match. */ | |
5270 | ||
5271 | void | |
3e43a32a MS |
5272 | linux_proc_pending_signals (int pid, sigset_t *pending, |
5273 | sigset_t *blocked, sigset_t *ignored) | |
dba24537 AC |
5274 | { |
5275 | FILE *procfile; | |
5276 | char buffer[MAXPATHLEN], fname[MAXPATHLEN]; | |
7c8a8b04 | 5277 | struct cleanup *cleanup; |
dba24537 AC |
5278 | |
5279 | sigemptyset (pending); | |
5280 | sigemptyset (blocked); | |
5281 | sigemptyset (ignored); | |
5282 | sprintf (fname, "/proc/%d/status", pid); | |
5283 | procfile = fopen (fname, "r"); | |
5284 | if (procfile == NULL) | |
8a3fe4f8 | 5285 | error (_("Could not open %s"), fname); |
7c8a8b04 | 5286 | cleanup = make_cleanup_fclose (procfile); |
dba24537 AC |
5287 | |
5288 | while (fgets (buffer, MAXPATHLEN, procfile) != NULL) | |
5289 | { | |
5290 | /* Normal queued signals are on the SigPnd line in the status | |
5291 | file. However, 2.6 kernels also have a "shared" pending | |
5292 | queue for delivering signals to a thread group, so check for | |
5293 | a ShdPnd line also. | |
5294 | ||
5295 | Unfortunately some Red Hat kernels include the shared pending | |
5296 | queue but not the ShdPnd status field. */ | |
5297 | ||
5298 | if (strncmp (buffer, "SigPnd:\t", 8) == 0) | |
5299 | add_line_to_sigset (buffer + 8, pending); | |
5300 | else if (strncmp (buffer, "ShdPnd:\t", 8) == 0) | |
5301 | add_line_to_sigset (buffer + 8, pending); | |
5302 | else if (strncmp (buffer, "SigBlk:\t", 8) == 0) | |
5303 | add_line_to_sigset (buffer + 8, blocked); | |
5304 | else if (strncmp (buffer, "SigIgn:\t", 8) == 0) | |
5305 | add_line_to_sigset (buffer + 8, ignored); | |
5306 | } | |
5307 | ||
7c8a8b04 | 5308 | do_cleanups (cleanup); |
dba24537 AC |
5309 | } |
5310 | ||
07e059b5 VP |
5311 | static LONGEST |
5312 | linux_nat_xfer_osdata (struct target_ops *ops, enum target_object object, | |
e0881a8e MS |
5313 | const char *annex, gdb_byte *readbuf, |
5314 | const gdb_byte *writebuf, ULONGEST offset, LONGEST len) | |
07e059b5 | 5315 | { |
07e059b5 VP |
5316 | gdb_assert (object == TARGET_OBJECT_OSDATA); |
5317 | ||
d26e3629 | 5318 | return linux_common_xfer_osdata (annex, readbuf, offset, len); |
07e059b5 VP |
5319 | } |
5320 | ||
10d6c8cd DJ |
5321 | static LONGEST |
5322 | linux_xfer_partial (struct target_ops *ops, enum target_object object, | |
5323 | const char *annex, gdb_byte *readbuf, | |
5324 | const gdb_byte *writebuf, ULONGEST offset, LONGEST len) | |
5325 | { | |
5326 | LONGEST xfer; | |
5327 | ||
5328 | if (object == TARGET_OBJECT_AUXV) | |
9f2982ff | 5329 | return memory_xfer_auxv (ops, object, annex, readbuf, writebuf, |
10d6c8cd DJ |
5330 | offset, len); |
5331 | ||
07e059b5 VP |
5332 | if (object == TARGET_OBJECT_OSDATA) |
5333 | return linux_nat_xfer_osdata (ops, object, annex, readbuf, writebuf, | |
5334 | offset, len); | |
5335 | ||
efcbbd14 UW |
5336 | if (object == TARGET_OBJECT_SPU) |
5337 | return linux_proc_xfer_spu (ops, object, annex, readbuf, writebuf, | |
5338 | offset, len); | |
5339 | ||
8f313923 JK |
5340 | /* GDB calculates all the addresses in possibly larget width of the address. |
5341 | Address width needs to be masked before its final use - either by | |
5342 | linux_proc_xfer_partial or inf_ptrace_xfer_partial. | |
5343 | ||
5344 | Compare ADDR_BIT first to avoid a compiler warning on shift overflow. */ | |
5345 | ||
5346 | if (object == TARGET_OBJECT_MEMORY) | |
5347 | { | |
5348 | int addr_bit = gdbarch_addr_bit (target_gdbarch); | |
5349 | ||
5350 | if (addr_bit < (sizeof (ULONGEST) * HOST_CHAR_BIT)) | |
5351 | offset &= ((ULONGEST) 1 << addr_bit) - 1; | |
5352 | } | |
5353 | ||
10d6c8cd DJ |
5354 | xfer = linux_proc_xfer_partial (ops, object, annex, readbuf, writebuf, |
5355 | offset, len); | |
5356 | if (xfer != 0) | |
5357 | return xfer; | |
5358 | ||
5359 | return super_xfer_partial (ops, object, annex, readbuf, writebuf, | |
5360 | offset, len); | |
5361 | } | |
5362 | ||
e9efe249 | 5363 | /* Create a prototype generic GNU/Linux target. The client can override |
10d6c8cd DJ |
5364 | it with local methods. */ |
5365 | ||
910122bf UW |
5366 | static void |
5367 | linux_target_install_ops (struct target_ops *t) | |
10d6c8cd | 5368 | { |
6d8fd2b7 | 5369 | t->to_insert_fork_catchpoint = linux_child_insert_fork_catchpoint; |
eb73ad13 | 5370 | t->to_remove_fork_catchpoint = linux_child_remove_fork_catchpoint; |
6d8fd2b7 | 5371 | t->to_insert_vfork_catchpoint = linux_child_insert_vfork_catchpoint; |
eb73ad13 | 5372 | t->to_remove_vfork_catchpoint = linux_child_remove_vfork_catchpoint; |
6d8fd2b7 | 5373 | t->to_insert_exec_catchpoint = linux_child_insert_exec_catchpoint; |
eb73ad13 | 5374 | t->to_remove_exec_catchpoint = linux_child_remove_exec_catchpoint; |
a96d9b2e | 5375 | t->to_set_syscall_catchpoint = linux_child_set_syscall_catchpoint; |
6d8fd2b7 | 5376 | t->to_pid_to_exec_file = linux_child_pid_to_exec_file; |
10d6c8cd | 5377 | t->to_post_startup_inferior = linux_child_post_startup_inferior; |
6d8fd2b7 UW |
5378 | t->to_post_attach = linux_child_post_attach; |
5379 | t->to_follow_fork = linux_child_follow_fork; | |
10d6c8cd DJ |
5380 | t->to_find_memory_regions = linux_nat_find_memory_regions; |
5381 | t->to_make_corefile_notes = linux_nat_make_corefile_notes; | |
5382 | ||
5383 | super_xfer_partial = t->to_xfer_partial; | |
5384 | t->to_xfer_partial = linux_xfer_partial; | |
910122bf UW |
5385 | } |
5386 | ||
5387 | struct target_ops * | |
5388 | linux_target (void) | |
5389 | { | |
5390 | struct target_ops *t; | |
5391 | ||
5392 | t = inf_ptrace_target (); | |
5393 | linux_target_install_ops (t); | |
5394 | ||
5395 | return t; | |
5396 | } | |
5397 | ||
5398 | struct target_ops * | |
7714d83a | 5399 | linux_trad_target (CORE_ADDR (*register_u_offset)(struct gdbarch *, int, int)) |
910122bf UW |
5400 | { |
5401 | struct target_ops *t; | |
5402 | ||
5403 | t = inf_ptrace_trad_target (register_u_offset); | |
5404 | linux_target_install_ops (t); | |
10d6c8cd | 5405 | |
10d6c8cd DJ |
5406 | return t; |
5407 | } | |
5408 | ||
b84876c2 PA |
5409 | /* target_is_async_p implementation. */ |
5410 | ||
5411 | static int | |
5412 | linux_nat_is_async_p (void) | |
5413 | { | |
5414 | /* NOTE: palves 2008-03-21: We're only async when the user requests | |
7feb7d06 | 5415 | it explicitly with the "set target-async" command. |
b84876c2 | 5416 | Someday, linux will always be async. */ |
3dd5b83d | 5417 | return target_async_permitted; |
b84876c2 PA |
5418 | } |
5419 | ||
5420 | /* target_can_async_p implementation. */ | |
5421 | ||
5422 | static int | |
5423 | linux_nat_can_async_p (void) | |
5424 | { | |
5425 | /* NOTE: palves 2008-03-21: We're only async when the user requests | |
7feb7d06 | 5426 | it explicitly with the "set target-async" command. |
b84876c2 | 5427 | Someday, linux will always be async. */ |
3dd5b83d | 5428 | return target_async_permitted; |
b84876c2 PA |
5429 | } |
5430 | ||
9908b566 VP |
5431 | static int |
5432 | linux_nat_supports_non_stop (void) | |
5433 | { | |
5434 | return 1; | |
5435 | } | |
5436 | ||
d90e17a7 PA |
5437 | /* True if we want to support multi-process. To be removed when GDB |
5438 | supports multi-exec. */ | |
5439 | ||
2277426b | 5440 | int linux_multi_process = 1; |
d90e17a7 PA |
5441 | |
5442 | static int | |
5443 | linux_nat_supports_multi_process (void) | |
5444 | { | |
5445 | return linux_multi_process; | |
5446 | } | |
5447 | ||
03583c20 UW |
5448 | static int |
5449 | linux_nat_supports_disable_randomization (void) | |
5450 | { | |
5451 | #ifdef HAVE_PERSONALITY | |
5452 | return 1; | |
5453 | #else | |
5454 | return 0; | |
5455 | #endif | |
5456 | } | |
5457 | ||
b84876c2 PA |
5458 | static int async_terminal_is_ours = 1; |
5459 | ||
5460 | /* target_terminal_inferior implementation. */ | |
5461 | ||
5462 | static void | |
5463 | linux_nat_terminal_inferior (void) | |
5464 | { | |
5465 | if (!target_is_async_p ()) | |
5466 | { | |
5467 | /* Async mode is disabled. */ | |
5468 | terminal_inferior (); | |
5469 | return; | |
5470 | } | |
5471 | ||
b84876c2 PA |
5472 | terminal_inferior (); |
5473 | ||
d9d2d8b6 | 5474 | /* Calls to target_terminal_*() are meant to be idempotent. */ |
b84876c2 PA |
5475 | if (!async_terminal_is_ours) |
5476 | return; | |
5477 | ||
5478 | delete_file_handler (input_fd); | |
5479 | async_terminal_is_ours = 0; | |
5480 | set_sigint_trap (); | |
5481 | } | |
5482 | ||
5483 | /* target_terminal_ours implementation. */ | |
5484 | ||
2c0b251b | 5485 | static void |
b84876c2 PA |
5486 | linux_nat_terminal_ours (void) |
5487 | { | |
5488 | if (!target_is_async_p ()) | |
5489 | { | |
5490 | /* Async mode is disabled. */ | |
5491 | terminal_ours (); | |
5492 | return; | |
5493 | } | |
5494 | ||
5495 | /* GDB should never give the terminal to the inferior if the | |
5496 | inferior is running in the background (run&, continue&, etc.), | |
5497 | but claiming it sure should. */ | |
5498 | terminal_ours (); | |
5499 | ||
b84876c2 PA |
5500 | if (async_terminal_is_ours) |
5501 | return; | |
5502 | ||
5503 | clear_sigint_trap (); | |
5504 | add_file_handler (input_fd, stdin_event_handler, 0); | |
5505 | async_terminal_is_ours = 1; | |
5506 | } | |
5507 | ||
5508 | static void (*async_client_callback) (enum inferior_event_type event_type, | |
5509 | void *context); | |
5510 | static void *async_client_context; | |
5511 | ||
7feb7d06 PA |
5512 | /* SIGCHLD handler that serves two purposes: In non-stop/async mode, |
5513 | so we notice when any child changes state, and notify the | |
5514 | event-loop; it allows us to use sigsuspend in linux_nat_wait_1 | |
5515 | above to wait for the arrival of a SIGCHLD. */ | |
5516 | ||
b84876c2 | 5517 | static void |
7feb7d06 | 5518 | sigchld_handler (int signo) |
b84876c2 | 5519 | { |
7feb7d06 PA |
5520 | int old_errno = errno; |
5521 | ||
01124a23 DE |
5522 | if (debug_linux_nat) |
5523 | ui_file_write_async_safe (gdb_stdlog, | |
5524 | "sigchld\n", sizeof ("sigchld\n") - 1); | |
7feb7d06 PA |
5525 | |
5526 | if (signo == SIGCHLD | |
5527 | && linux_nat_event_pipe[0] != -1) | |
5528 | async_file_mark (); /* Let the event loop know that there are | |
5529 | events to handle. */ | |
5530 | ||
5531 | errno = old_errno; | |
5532 | } | |
5533 | ||
5534 | /* Callback registered with the target events file descriptor. */ | |
5535 | ||
5536 | static void | |
5537 | handle_target_event (int error, gdb_client_data client_data) | |
5538 | { | |
5539 | (*async_client_callback) (INF_REG_EVENT, async_client_context); | |
5540 | } | |
5541 | ||
5542 | /* Create/destroy the target events pipe. Returns previous state. */ | |
5543 | ||
5544 | static int | |
5545 | linux_async_pipe (int enable) | |
5546 | { | |
5547 | int previous = (linux_nat_event_pipe[0] != -1); | |
5548 | ||
5549 | if (previous != enable) | |
5550 | { | |
5551 | sigset_t prev_mask; | |
5552 | ||
5553 | block_child_signals (&prev_mask); | |
5554 | ||
5555 | if (enable) | |
5556 | { | |
5557 | if (pipe (linux_nat_event_pipe) == -1) | |
5558 | internal_error (__FILE__, __LINE__, | |
5559 | "creating event pipe failed."); | |
5560 | ||
5561 | fcntl (linux_nat_event_pipe[0], F_SETFL, O_NONBLOCK); | |
5562 | fcntl (linux_nat_event_pipe[1], F_SETFL, O_NONBLOCK); | |
5563 | } | |
5564 | else | |
5565 | { | |
5566 | close (linux_nat_event_pipe[0]); | |
5567 | close (linux_nat_event_pipe[1]); | |
5568 | linux_nat_event_pipe[0] = -1; | |
5569 | linux_nat_event_pipe[1] = -1; | |
5570 | } | |
5571 | ||
5572 | restore_child_signals_mask (&prev_mask); | |
5573 | } | |
5574 | ||
5575 | return previous; | |
b84876c2 PA |
5576 | } |
5577 | ||
5578 | /* target_async implementation. */ | |
5579 | ||
5580 | static void | |
5581 | linux_nat_async (void (*callback) (enum inferior_event_type event_type, | |
5582 | void *context), void *context) | |
5583 | { | |
b84876c2 PA |
5584 | if (callback != NULL) |
5585 | { | |
5586 | async_client_callback = callback; | |
5587 | async_client_context = context; | |
7feb7d06 PA |
5588 | if (!linux_async_pipe (1)) |
5589 | { | |
5590 | add_file_handler (linux_nat_event_pipe[0], | |
5591 | handle_target_event, NULL); | |
5592 | /* There may be pending events to handle. Tell the event loop | |
5593 | to poll them. */ | |
5594 | async_file_mark (); | |
5595 | } | |
b84876c2 PA |
5596 | } |
5597 | else | |
5598 | { | |
5599 | async_client_callback = callback; | |
5600 | async_client_context = context; | |
b84876c2 | 5601 | delete_file_handler (linux_nat_event_pipe[0]); |
7feb7d06 | 5602 | linux_async_pipe (0); |
b84876c2 PA |
5603 | } |
5604 | return; | |
5605 | } | |
5606 | ||
252fbfc8 PA |
5607 | /* Stop an LWP, and push a TARGET_SIGNAL_0 stop status if no other |
5608 | event came out. */ | |
5609 | ||
4c28f408 | 5610 | static int |
252fbfc8 | 5611 | linux_nat_stop_lwp (struct lwp_info *lwp, void *data) |
4c28f408 | 5612 | { |
d90e17a7 | 5613 | if (!lwp->stopped) |
252fbfc8 | 5614 | { |
d90e17a7 | 5615 | ptid_t ptid = lwp->ptid; |
252fbfc8 | 5616 | |
d90e17a7 PA |
5617 | if (debug_linux_nat) |
5618 | fprintf_unfiltered (gdb_stdlog, | |
5619 | "LNSL: running -> suspending %s\n", | |
5620 | target_pid_to_str (lwp->ptid)); | |
252fbfc8 | 5621 | |
252fbfc8 | 5622 | |
25289eb2 PA |
5623 | if (lwp->last_resume_kind == resume_stop) |
5624 | { | |
5625 | if (debug_linux_nat) | |
5626 | fprintf_unfiltered (gdb_stdlog, | |
5627 | "linux-nat: already stopping LWP %ld at " | |
5628 | "GDB's request\n", | |
5629 | ptid_get_lwp (lwp->ptid)); | |
5630 | return 0; | |
5631 | } | |
252fbfc8 | 5632 | |
25289eb2 PA |
5633 | stop_callback (lwp, NULL); |
5634 | lwp->last_resume_kind = resume_stop; | |
d90e17a7 PA |
5635 | } |
5636 | else | |
5637 | { | |
5638 | /* Already known to be stopped; do nothing. */ | |
252fbfc8 | 5639 | |
d90e17a7 PA |
5640 | if (debug_linux_nat) |
5641 | { | |
e09875d4 | 5642 | if (find_thread_ptid (lwp->ptid)->stop_requested) |
3e43a32a MS |
5643 | fprintf_unfiltered (gdb_stdlog, |
5644 | "LNSL: already stopped/stop_requested %s\n", | |
d90e17a7 PA |
5645 | target_pid_to_str (lwp->ptid)); |
5646 | else | |
3e43a32a MS |
5647 | fprintf_unfiltered (gdb_stdlog, |
5648 | "LNSL: already stopped/no " | |
5649 | "stop_requested yet %s\n", | |
d90e17a7 | 5650 | target_pid_to_str (lwp->ptid)); |
252fbfc8 PA |
5651 | } |
5652 | } | |
4c28f408 PA |
5653 | return 0; |
5654 | } | |
5655 | ||
5656 | static void | |
5657 | linux_nat_stop (ptid_t ptid) | |
5658 | { | |
5659 | if (non_stop) | |
d90e17a7 | 5660 | iterate_over_lwps (ptid, linux_nat_stop_lwp, NULL); |
4c28f408 PA |
5661 | else |
5662 | linux_ops->to_stop (ptid); | |
5663 | } | |
5664 | ||
d90e17a7 PA |
5665 | static void |
5666 | linux_nat_close (int quitting) | |
5667 | { | |
5668 | /* Unregister from the event loop. */ | |
5669 | if (target_is_async_p ()) | |
5670 | target_async (NULL, 0); | |
5671 | ||
d90e17a7 PA |
5672 | if (linux_ops->to_close) |
5673 | linux_ops->to_close (quitting); | |
5674 | } | |
5675 | ||
c0694254 PA |
5676 | /* When requests are passed down from the linux-nat layer to the |
5677 | single threaded inf-ptrace layer, ptids of (lwpid,0,0) form are | |
5678 | used. The address space pointer is stored in the inferior object, | |
5679 | but the common code that is passed such ptid can't tell whether | |
5680 | lwpid is a "main" process id or not (it assumes so). We reverse | |
5681 | look up the "main" process id from the lwp here. */ | |
5682 | ||
5683 | struct address_space * | |
5684 | linux_nat_thread_address_space (struct target_ops *t, ptid_t ptid) | |
5685 | { | |
5686 | struct lwp_info *lwp; | |
5687 | struct inferior *inf; | |
5688 | int pid; | |
5689 | ||
5690 | pid = GET_LWP (ptid); | |
5691 | if (GET_LWP (ptid) == 0) | |
5692 | { | |
5693 | /* An (lwpid,0,0) ptid. Look up the lwp object to get at the | |
5694 | tgid. */ | |
5695 | lwp = find_lwp_pid (ptid); | |
5696 | pid = GET_PID (lwp->ptid); | |
5697 | } | |
5698 | else | |
5699 | { | |
5700 | /* A (pid,lwpid,0) ptid. */ | |
5701 | pid = GET_PID (ptid); | |
5702 | } | |
5703 | ||
5704 | inf = find_inferior_pid (pid); | |
5705 | gdb_assert (inf != NULL); | |
5706 | return inf->aspace; | |
5707 | } | |
5708 | ||
dc146f7c VP |
5709 | int |
5710 | linux_nat_core_of_thread_1 (ptid_t ptid) | |
5711 | { | |
5712 | struct cleanup *back_to; | |
5713 | char *filename; | |
5714 | FILE *f; | |
5715 | char *content = NULL; | |
5716 | char *p; | |
5717 | char *ts = 0; | |
5718 | int content_read = 0; | |
5719 | int i; | |
5720 | int core; | |
5721 | ||
5722 | filename = xstrprintf ("/proc/%d/task/%ld/stat", | |
5723 | GET_PID (ptid), GET_LWP (ptid)); | |
5724 | back_to = make_cleanup (xfree, filename); | |
5725 | ||
5726 | f = fopen (filename, "r"); | |
5727 | if (!f) | |
5728 | { | |
5729 | do_cleanups (back_to); | |
5730 | return -1; | |
5731 | } | |
5732 | ||
5733 | make_cleanup_fclose (f); | |
5734 | ||
5735 | for (;;) | |
5736 | { | |
5737 | int n; | |
e0881a8e | 5738 | |
dc146f7c VP |
5739 | content = xrealloc (content, content_read + 1024); |
5740 | n = fread (content + content_read, 1, 1024, f); | |
5741 | content_read += n; | |
5742 | if (n < 1024) | |
5743 | { | |
5744 | content[content_read] = '\0'; | |
5745 | break; | |
5746 | } | |
5747 | } | |
5748 | ||
5749 | make_cleanup (xfree, content); | |
5750 | ||
5751 | p = strchr (content, '('); | |
ca2a87a0 JK |
5752 | |
5753 | /* Skip ")". */ | |
5754 | if (p != NULL) | |
5755 | p = strchr (p, ')'); | |
5756 | if (p != NULL) | |
5757 | p++; | |
dc146f7c VP |
5758 | |
5759 | /* If the first field after program name has index 0, then core number is | |
5760 | the field with index 36. There's no constant for that anywhere. */ | |
ca2a87a0 JK |
5761 | if (p != NULL) |
5762 | p = strtok_r (p, " ", &ts); | |
5763 | for (i = 0; p != NULL && i != 36; ++i) | |
dc146f7c VP |
5764 | p = strtok_r (NULL, " ", &ts); |
5765 | ||
ca2a87a0 | 5766 | if (p == NULL || sscanf (p, "%d", &core) == 0) |
dc146f7c VP |
5767 | core = -1; |
5768 | ||
5769 | do_cleanups (back_to); | |
5770 | ||
5771 | return core; | |
5772 | } | |
5773 | ||
5774 | /* Return the cached value of the processor core for thread PTID. */ | |
5775 | ||
5776 | int | |
5777 | linux_nat_core_of_thread (struct target_ops *ops, ptid_t ptid) | |
5778 | { | |
5779 | struct lwp_info *info = find_lwp_pid (ptid); | |
e0881a8e | 5780 | |
dc146f7c VP |
5781 | if (info) |
5782 | return info->core; | |
5783 | return -1; | |
5784 | } | |
5785 | ||
f973ed9c DJ |
5786 | void |
5787 | linux_nat_add_target (struct target_ops *t) | |
5788 | { | |
f973ed9c DJ |
5789 | /* Save the provided single-threaded target. We save this in a separate |
5790 | variable because another target we've inherited from (e.g. inf-ptrace) | |
5791 | may have saved a pointer to T; we want to use it for the final | |
5792 | process stratum target. */ | |
5793 | linux_ops_saved = *t; | |
5794 | linux_ops = &linux_ops_saved; | |
5795 | ||
5796 | /* Override some methods for multithreading. */ | |
b84876c2 | 5797 | t->to_create_inferior = linux_nat_create_inferior; |
f973ed9c DJ |
5798 | t->to_attach = linux_nat_attach; |
5799 | t->to_detach = linux_nat_detach; | |
5800 | t->to_resume = linux_nat_resume; | |
5801 | t->to_wait = linux_nat_wait; | |
2455069d | 5802 | t->to_pass_signals = linux_nat_pass_signals; |
f973ed9c DJ |
5803 | t->to_xfer_partial = linux_nat_xfer_partial; |
5804 | t->to_kill = linux_nat_kill; | |
5805 | t->to_mourn_inferior = linux_nat_mourn_inferior; | |
5806 | t->to_thread_alive = linux_nat_thread_alive; | |
5807 | t->to_pid_to_str = linux_nat_pid_to_str; | |
4694da01 | 5808 | t->to_thread_name = linux_nat_thread_name; |
f973ed9c | 5809 | t->to_has_thread_control = tc_schedlock; |
c0694254 | 5810 | t->to_thread_address_space = linux_nat_thread_address_space; |
ebec9a0f PA |
5811 | t->to_stopped_by_watchpoint = linux_nat_stopped_by_watchpoint; |
5812 | t->to_stopped_data_address = linux_nat_stopped_data_address; | |
f973ed9c | 5813 | |
b84876c2 PA |
5814 | t->to_can_async_p = linux_nat_can_async_p; |
5815 | t->to_is_async_p = linux_nat_is_async_p; | |
9908b566 | 5816 | t->to_supports_non_stop = linux_nat_supports_non_stop; |
b84876c2 | 5817 | t->to_async = linux_nat_async; |
b84876c2 PA |
5818 | t->to_terminal_inferior = linux_nat_terminal_inferior; |
5819 | t->to_terminal_ours = linux_nat_terminal_ours; | |
d90e17a7 | 5820 | t->to_close = linux_nat_close; |
b84876c2 | 5821 | |
4c28f408 PA |
5822 | /* Methods for non-stop support. */ |
5823 | t->to_stop = linux_nat_stop; | |
5824 | ||
d90e17a7 PA |
5825 | t->to_supports_multi_process = linux_nat_supports_multi_process; |
5826 | ||
03583c20 UW |
5827 | t->to_supports_disable_randomization |
5828 | = linux_nat_supports_disable_randomization; | |
5829 | ||
dc146f7c VP |
5830 | t->to_core_of_thread = linux_nat_core_of_thread; |
5831 | ||
f973ed9c DJ |
5832 | /* We don't change the stratum; this target will sit at |
5833 | process_stratum and thread_db will set at thread_stratum. This | |
5834 | is a little strange, since this is a multi-threaded-capable | |
5835 | target, but we want to be on the stack below thread_db, and we | |
5836 | also want to be used for single-threaded processes. */ | |
5837 | ||
5838 | add_target (t); | |
f973ed9c DJ |
5839 | } |
5840 | ||
9f0bdab8 DJ |
5841 | /* Register a method to call whenever a new thread is attached. */ |
5842 | void | |
5843 | linux_nat_set_new_thread (struct target_ops *t, void (*new_thread) (ptid_t)) | |
5844 | { | |
5845 | /* Save the pointer. We only support a single registered instance | |
5846 | of the GNU/Linux native target, so we do not need to map this to | |
5847 | T. */ | |
5848 | linux_nat_new_thread = new_thread; | |
5849 | } | |
5850 | ||
5b009018 PA |
5851 | /* Register a method that converts a siginfo object between the layout |
5852 | that ptrace returns, and the layout in the architecture of the | |
5853 | inferior. */ | |
5854 | void | |
5855 | linux_nat_set_siginfo_fixup (struct target_ops *t, | |
5856 | int (*siginfo_fixup) (struct siginfo *, | |
5857 | gdb_byte *, | |
5858 | int)) | |
5859 | { | |
5860 | /* Save the pointer. */ | |
5861 | linux_nat_siginfo_fixup = siginfo_fixup; | |
5862 | } | |
5863 | ||
9f0bdab8 DJ |
5864 | /* Return the saved siginfo associated with PTID. */ |
5865 | struct siginfo * | |
5866 | linux_nat_get_siginfo (ptid_t ptid) | |
5867 | { | |
5868 | struct lwp_info *lp = find_lwp_pid (ptid); | |
5869 | ||
5870 | gdb_assert (lp != NULL); | |
5871 | ||
5872 | return &lp->siginfo; | |
5873 | } | |
5874 | ||
2c0b251b PA |
5875 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
5876 | extern initialize_file_ftype _initialize_linux_nat; | |
5877 | ||
d6b0e80f AC |
5878 | void |
5879 | _initialize_linux_nat (void) | |
5880 | { | |
f179e162 JK |
5881 | static struct cmd_list_element *info_proc_cmdlist; |
5882 | ||
5883 | add_prefix_cmd ("proc", class_info, linux_nat_info_proc_cmd, | |
5884 | _("\ | |
1bedd215 | 5885 | Show /proc process information about any running process.\n\ |
f179e162 JK |
5886 | Specify any process id, or use the program being debugged by default."), |
5887 | &info_proc_cmdlist, "info proc ", | |
5888 | 1/*allow-unknown*/, &infolist); | |
5889 | ||
5890 | add_cmd ("mappings", class_info, linux_nat_info_proc_cmd_mappings, _("\ | |
5891 | List of mapped memory regions."), | |
5892 | &info_proc_cmdlist); | |
5893 | ||
5894 | add_cmd ("stat", class_info, linux_nat_info_proc_cmd_stat, _("\ | |
080ad648 | 5895 | List process info from /proc/PID/stat."), |
f179e162 JK |
5896 | &info_proc_cmdlist); |
5897 | ||
5898 | add_cmd ("status", class_info, linux_nat_info_proc_cmd_status, _("\ | |
080ad648 | 5899 | List process info from /proc/PID/status."), |
f179e162 JK |
5900 | &info_proc_cmdlist); |
5901 | ||
5902 | add_cmd ("cwd", class_info, linux_nat_info_proc_cmd_cwd, _("\ | |
080ad648 | 5903 | List current working directory of the process."), |
f179e162 JK |
5904 | &info_proc_cmdlist); |
5905 | ||
5906 | add_cmd ("cmdline", class_info, linux_nat_info_proc_cmd_cmdline, _("\ | |
080ad648 | 5907 | List command line arguments of the process."), |
f179e162 JK |
5908 | &info_proc_cmdlist); |
5909 | ||
5910 | add_cmd ("exe", class_info, linux_nat_info_proc_cmd_exe, _("\ | |
080ad648 | 5911 | List absolute filename for executable of the process."), |
f179e162 JK |
5912 | &info_proc_cmdlist); |
5913 | ||
5914 | add_cmd ("all", class_info, linux_nat_info_proc_cmd_all, _("\ | |
5915 | List all available /proc info."), | |
5916 | &info_proc_cmdlist); | |
d6b0e80f | 5917 | |
b84876c2 PA |
5918 | add_setshow_zinteger_cmd ("lin-lwp", class_maintenance, |
5919 | &debug_linux_nat, _("\ | |
5920 | Set debugging of GNU/Linux lwp module."), _("\ | |
5921 | Show debugging of GNU/Linux lwp module."), _("\ | |
5922 | Enables printf debugging output."), | |
5923 | NULL, | |
5924 | show_debug_linux_nat, | |
5925 | &setdebuglist, &showdebuglist); | |
5926 | ||
b84876c2 | 5927 | /* Save this mask as the default. */ |
d6b0e80f AC |
5928 | sigprocmask (SIG_SETMASK, NULL, &normal_mask); |
5929 | ||
7feb7d06 PA |
5930 | /* Install a SIGCHLD handler. */ |
5931 | sigchld_action.sa_handler = sigchld_handler; | |
5932 | sigemptyset (&sigchld_action.sa_mask); | |
5933 | sigchld_action.sa_flags = SA_RESTART; | |
b84876c2 PA |
5934 | |
5935 | /* Make it the default. */ | |
7feb7d06 | 5936 | sigaction (SIGCHLD, &sigchld_action, NULL); |
d6b0e80f AC |
5937 | |
5938 | /* Make sure we don't block SIGCHLD during a sigsuspend. */ | |
5939 | sigprocmask (SIG_SETMASK, NULL, &suspend_mask); | |
5940 | sigdelset (&suspend_mask, SIGCHLD); | |
5941 | ||
7feb7d06 | 5942 | sigemptyset (&blocked_mask); |
d6b0e80f AC |
5943 | } |
5944 | \f | |
5945 | ||
5946 | /* FIXME: kettenis/2000-08-26: The stuff on this page is specific to | |
5947 | the GNU/Linux Threads library and therefore doesn't really belong | |
5948 | here. */ | |
5949 | ||
5950 | /* Read variable NAME in the target and return its value if found. | |
5951 | Otherwise return zero. It is assumed that the type of the variable | |
5952 | is `int'. */ | |
5953 | ||
5954 | static int | |
5955 | get_signo (const char *name) | |
5956 | { | |
5957 | struct minimal_symbol *ms; | |
5958 | int signo; | |
5959 | ||
5960 | ms = lookup_minimal_symbol (name, NULL, NULL); | |
5961 | if (ms == NULL) | |
5962 | return 0; | |
5963 | ||
8e70166d | 5964 | if (target_read_memory (SYMBOL_VALUE_ADDRESS (ms), (gdb_byte *) &signo, |
d6b0e80f AC |
5965 | sizeof (signo)) != 0) |
5966 | return 0; | |
5967 | ||
5968 | return signo; | |
5969 | } | |
5970 | ||
5971 | /* Return the set of signals used by the threads library in *SET. */ | |
5972 | ||
5973 | void | |
5974 | lin_thread_get_thread_signals (sigset_t *set) | |
5975 | { | |
5976 | struct sigaction action; | |
5977 | int restart, cancel; | |
5978 | ||
b84876c2 | 5979 | sigemptyset (&blocked_mask); |
d6b0e80f AC |
5980 | sigemptyset (set); |
5981 | ||
5982 | restart = get_signo ("__pthread_sig_restart"); | |
17fbb0bd DJ |
5983 | cancel = get_signo ("__pthread_sig_cancel"); |
5984 | ||
5985 | /* LinuxThreads normally uses the first two RT signals, but in some legacy | |
5986 | cases may use SIGUSR1/SIGUSR2. NPTL always uses RT signals, but does | |
5987 | not provide any way for the debugger to query the signal numbers - | |
5988 | fortunately they don't change! */ | |
5989 | ||
d6b0e80f | 5990 | if (restart == 0) |
17fbb0bd | 5991 | restart = __SIGRTMIN; |
d6b0e80f | 5992 | |
d6b0e80f | 5993 | if (cancel == 0) |
17fbb0bd | 5994 | cancel = __SIGRTMIN + 1; |
d6b0e80f AC |
5995 | |
5996 | sigaddset (set, restart); | |
5997 | sigaddset (set, cancel); | |
5998 | ||
5999 | /* The GNU/Linux Threads library makes terminating threads send a | |
6000 | special "cancel" signal instead of SIGCHLD. Make sure we catch | |
6001 | those (to prevent them from terminating GDB itself, which is | |
6002 | likely to be their default action) and treat them the same way as | |
6003 | SIGCHLD. */ | |
6004 | ||
6005 | action.sa_handler = sigchld_handler; | |
6006 | sigemptyset (&action.sa_mask); | |
58aecb61 | 6007 | action.sa_flags = SA_RESTART; |
d6b0e80f AC |
6008 | sigaction (cancel, &action, NULL); |
6009 | ||
6010 | /* We block the "cancel" signal throughout this code ... */ | |
6011 | sigaddset (&blocked_mask, cancel); | |
6012 | sigprocmask (SIG_BLOCK, &blocked_mask, NULL); | |
6013 | ||
6014 | /* ... except during a sigsuspend. */ | |
6015 | sigdelset (&suspend_mask, cancel); | |
6016 | } |